∫ 2 到-2(更号4-x+2x-sinx)dx

∫ 2 到-2(更号4-x+2x-sinx)dx 定积分0到π x*((sin(x))^2-(sin(x))^4)^(1/2) sin（x／2）﹣ cos（x／2）＝ 更号2 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 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 定积分问题:范围是0到pi/2 ∫sin ^2x / sin x+cos x dx sin(pi/x)/x^2 积分从1到2 求证：更号3cosX-sinX=2sin(派/3-x) (1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x sin(x^2)/sin^2x 求导 已知sin(x/2)+cos(x/2)=（2*更号3）/3,那么sinx的值为多少? ∫sin^2x/(1+sin^2x )dx求解, ∫sin(6x)sin(2x)dx=? 2sin(x+π/4)sin(x-π/4)=? ∫x/sin^2xdx ∫x/sin^2(x) dx