y=1/2sin(1/2x+π/3),x∈R 求函数的最大值最小值的自变量x的集合

sinx=1/3,sin(x+y)=1,求sin（2y+x）=? 已知sinx=1/3,sin(x+y)=1,则sin（2y+x)= siny=1/3,sin(x＋y)=1,求sin(2x＋y) (cosx)^2-(cosy)^2=1/3求sin(x+y)*sin(x-y). Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) y=2sin三分之一x y=4sin(x-π/3) y=sin(2x+π/6) y=3sin(1/2x-π/4) 的周期各是多少, y=sin(x-π/6) 和 y=1/2sin(π/3-2x) 的单增区间, sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值 cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2 y =sin(2x-1)求导! 高数 求导 1 Y=x+x^x 2 Y=sin(x+y高数求导1 Y=x+x^x2 Y=sin(x+y)的二阶导数3 x+y= e^(xy) y=1-x^2 x>=0 ,y=sin|x|/x x 求函数y=sin(x+1/3兀)sin(x+1/2兀)的周期 三角函数：y=（3sin x+1）/（sin x+2）的值域为（） 傅里叶级数作图f（x）=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]我用mathematica输入程序Plot[{2sin[x],-2sin[x],2sin[x] - sin[2x],-2sin[x] + sin[2x],2sin[x] - sin[2x] + 2/3sin[3x],-2sin[x] + sin[2x] - 2/3sin[3x],2sin[x] - sin[2x] + 2/3si matlab中一些新手问题,syms x y;y =ezplot('1/5*(-2-5/(-125+100*sin(x))*(-20*sin(x)+40+10*(-121*sin(x)^2-100*sin(x)+121+100*sin(x)^3)^(1/2))+5/2*sin(x)/(-125+100*sin(x))*(-20*sin(x)+40+10*(-121*sin(x)^2-100*sin(x)+121+100*sin(x)^3)^(1/2)))*cos(x) 解微分方程：x(y´+1)+sin(x+y)=0, y(π/2)=0 已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2