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=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, 求证sin²x-sin²y=sin(x+y)sin(x-y) 证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+y)/2) 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) y=[sin^2(x)]*[sin^2(x)]求导 y=(sin x + COS x)^2 Mathematica y''+ sin(x) y=x 证明sin(x+y)sin(x-y)=sinx-siny sin(x+y)sin(x-y)=k,求cos^2x-cos^2y y=sin根号x y=sinx+sin|x| 求y=sin[sin(x^2)]的导数 3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? y =sin(2x-1)求导! y=sin(2x+a)(0 y=|sin 2x| 周期 y=e^[(sin^2)x]求导! y=sin(2x+a)（0