设y=(x^2+1)^100 ,求dy

设y=(x^2+1)^100 ,求dy 设y=cos^2(x+1),求dy 设y=sin2x/(1+x^2),求dy/dx, 设y=√(x^2-1)求dy/dx 设y=（x/1-x)^x,求dy/dx 设y=(2+x)^x,(x>0) ,求dy 设y=sin[x/(1=x)]求dy 设y=ln(x/1+x)-cot2x,求dy. 设y=[e^x+e^(-x)]^2,求dy 设y=sin x/1+x^2,求y’及dy 设x^2+y^2=4,求dy/dx 设y=(1-x)³cosx,求dy/dx