化简y=sin(x+20度)+sin(x+80度

化简y=sin(x+20度)+sin(x+80度 求证sin²x-sin²y=sin(x+y)sin(x-y) 函数Y=3sin(x+20度)+5sin(x+80度)的最大值? 化简sin (x+y)sin x +cos (x+y)cos x= 证明sin(x+y)sin(x-y)=sinx-siny y=sin根号x y=sinx+sin|x| 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) Mathematica y''+ sin(x) y=x 化简sin(2x-y)*sin y+cos(2x-y)*sin y y=[sin^2(x)]*[sin^2(x)]求导 sin(x.y)中, sin(x)^y求导 一道三角恒等式证明题请证明sin(x+y)sin(x-y)=sin^2(x)-sin^2(y) 化简y=sin^2 x + cos 2x 求周期sin^2 x 是平方 化简sin(x+y)sin(x-y)-cos(x+y)cos(x-y)的结果是? 化简sin(x+y)cos(x-y)+cos(x+y)sin(x-y) y=(sin x + COS x)^2