关于用matlab解方程组函数是这样的f(t)=(a/b)*cos(dt)-kt已知t=1时f(1),t=2时f(2),t=3时f(3),根据上面的已知条件 求a b d的值,值用已知条件表示 给出编程语言和结果不好意思 我写错了 应该是函数f(t)=(a/b

关于用matlab解方程组函数是这样的f(t)=(a/b)*cos(dt)-kt已知t=1时f(1),t=2时f(2),t=3时f(3),根据上面的已知条件 求a b d的值,值用已知条件表示 给出编程语言和结果不好意思 我写错了 应该是函数f(t)=(a/b
关于用matlab解方程组
函数是这样的f(t)=(a/b)*cos(dt)-kt
已知t=1时f(1),t=2时f(2),t=3时f(3),
根据上面的已知条件 求a b d的值,
值用已知条件表示 给出编程语言和结果
不好意思 我写错了 应该是
函数f(t)=(a/b)*cos（b*t）-kt
已知t=1时f(1),t=2时f(2),t=3时f(3),
根据上面的已知条件 求a b k的值,
值用已知条件表示 给出编程语言和结果

关于用matlab解方程组函数是这样的f(t)=(a/b)*cos(dt)-kt已知t=1时f(1),t=2时f(2),t=3时f(3),根据上面的已知条件 求a b d的值,值用已知条件表示 给出编程语言和结果不好意思 我写错了 应该是函数f(t)=(a/b
S=solve('a/b*cos(b)-k=f1','a/b*cos(2*b)-k*2=f2','a/b*cos(3*b)-k*3=f3','a,b,k');
a= -acos(-1/12/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/12*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(3*f1-f3)/(2*f1-f2)+1/2*i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)))*(2*f1-f2)/(-1+1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/3*(3*f1-f3)/(2*f1-f2)-i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3))+2*(-1/12/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/12*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(3*f1-f3)/(2*f1-f2)+1/2*i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)))^2)
-acos(-1/12/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/12*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(3*f1-f3)/(2*f1-f2)-1/2*i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)))*(2*f1-f2)/(-1+1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/3*(3*f1-f3)/(2*f1-f2)+i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3))+2*(-1/12/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/12*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(3*f1-f3)/(2*f1-f2)-1/2*i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)))^2)

b=acos(-1/12/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/12*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(3*f1-f3)/(2*f1-f2)+1/2*i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)))
acos(-1/12/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/12*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)+1/6*(3*f1-f3)/(2*f1-f2)-1/2*i*3^(1/2)*(1/6/(2*f1-f2)*(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)-1/6*(45*f1^2-54*f1*f2+6*f3*f1-6*f3*f2+18*f2^2+f3^2)/(2*f1-f2)/(-135*f1^3+81*f1^2*f2+81*f3*f1^2-54*f1*f3*f2-9*f1*f3^2+9*f2*f3^2-f3^3+6*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f1-3*(-2025*f1^4+6480*f1^3*f2-1620*f1^3*f3+2592*f1^2*f3*f2-54*f1^2*f3^2-6804*f1^2*f2^2+3240*f1*f2^3-84*f3^3*f1-1944*f1*f2^2*f3+432*f1*f2*f3^2-324*f3^2*f2^2+648*f3*f2^3-648*f2^4+96*f3^3*f2-9*f3^4)^(1/2)*f2)^(1/3)))

k就不发了,要不然超过10000字了,