设y=(x^2),求dy/dx令y=sinu,u=x^2,则dy/du乘以du/dx=sinu/u乘以x^2/x为什么等于cosu乘以2x

设x^2+y^2=4,求dy/dx 设y=√(x^2-1)求dy/dx 设y=(tan2x)^cot(x/2) ,求dy/dx 设y=sin2x/(1+x^2),求dy/dx, 设y=sin2x/(1+x^2),求dy/dx, 设 x/y=ln(y/x) ,求 dy/dx 设y=（x/1-x)^x,求dy/dx 设y=2arctany/x,求dy/dx,dy^2/d^2x. 设y=(x^2),求dy/dx令y=sinu,u=x^2,则dy/du乘以du/dx=sinu/u乘以x^2/x为什么等于cosu乘以2x 设（X=TCOST,Y=TSINT,求DY/DX 设sin(x+y)=xy,求dy/dx. 设y=(1-x)³cosx,求dy/dx 设y=x分子sin2x.求dx分子dy. 设x+y=siny,求dy/dx x^y-y^x=2,求dy/dx 求dy/dx=(x-y+5)/(x+y-2) 设函数y=y(x)由方程y+e^(x+y)=2x确定,求dx/dy 设y-x-1/2sinx,则dx/dy=