sin(x+60`)+2sin(x-60`)-」3cos(120`-x)的值

1-2sinx*sin(60+x)sin(60-x) 解方程sinx+sin(60-x)=sin(60+x) 化简sin(x+60)+2sinx-60 sin(x^2)/sin^2x 求导 sin(x+60`)+2sin(x-60`)-」3cos(120`-x)的值 化简sin(-2x) lim(x(sin)^2) sin^2(x)求导 sin(2x)积分 sin x sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) ? sin(45-3x)*cos(60-3x)-cos(30+3x)*sin(45+3x) 化简 cos^2(x)*sin^2(x)-sin^2(x) 化简 cos^(2)(x)*sin^(2)(x)-sin^(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 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x x*（1+sin^2 x )/sin^2x 不定积分