x*y'*sin(y/x)-y*sin(y/x)+x=0 求微分方程的解和答案算的不一样...

sin(x.y)中, sin(x)^y求导 求证sin²x-sin²y=sin(x+y)sin(x-y) Mathematica y''+ sin(x) y=x 化简sin(2x-y)*sin y+cos(2x-y)*sin y 证明sin(x+y)sin(x-y)=sinx-siny y=sin根号x y=sinx+sin|x| sin(x+y)的导数 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) sin(x-y)sin(x+y)-cos(x-y)cos(x+y) 三角不等式证明证明sin(x+y)+sin(y+z)+sin(z+x)>sinx+siny+sinz+sin(x+y+z) 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) 求微分方程y'cos y+ sin(x-y)=sin(x+y)的通解. 请问sin（x+y）cos y-cos（x+y）sin y得多少 y=(sin x + COS x)^2 求导 y=sin(x^x)