设sin(x+y)sin(x-y)=m,则cos^2x-cos^2y的值

设sin(x+y)sin(x-y)=m,则cos^2x-cos^2y的值 求证sin²x-sin²y=sin(x+y)sin(x-y) 设函数 f(x)=sin(2x+y),(-π 已知(sinx)2-(siny)2=m求sin(x y)sin(x-y)求sin(x+y)sin(x-y) 设集合M=｛y|y=|cos^2-sin^2|,x属于R｝,N={x||x-(1/i)| sin（x+y）*sin（y-x）=m,cosx的平方-cosy的平方? Mathematica y''+ sin(x) y=x Z=x*sin xy+e^x+y或设y=(x)是由方程xy+sin x+sin y=1确定,求y” 证明sin(x+y)sin(x-y)=sinx-siny y=sin根号x y=sinx+sin|x| 设集合M={Y=绝对值（cos^x-sin^x),x属于R},N={绝对值（x/i） 设sin(x+y)=xy,求dy/dx. 设函数y=3sin(2x+φ)（0 设Y=lnx+sin x分之1.求dy sin(x.y)中, sin(x)^y求导 设y=e^(x/2)+x^2*sin√x,求y′