如果 2sin(x-y)=sin(x+y),证明 tanx= 3 tany

如果 2sin(x-y)=sin(x+y),证明 tanx= 3 tany 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) 求证sin²x-sin²y=sin(x+y)sin(x-y) y=[sin^2(x)]*[sin^2(x)]求导 y=(sin x + COS x)^2 如果函数y=3sin(2x+&)(0 sin(x+y)sin(x-y)=k,求cos^2x-cos^2y Mathematica y''+ sin(x) y=x 证明sin(x+y)sin(x-y)=sinx-siny 求y=sin[sin(x^2)]的导数 y=sin根号x y=sinx+sin|x| 化简sin(2x-y)*sin y+cos(2x-y)*sin y 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!