y=(1+x^4)^cos x,求dy急

y=(1+x^4)^cos x,求dy急 设y=e^(-x) cos 1/x,求dy. y=e_x cos x 求dy y=(cos^2x) 求dy 函数y=cos(2x+π/4) 求dy 设y=cos^2(x+1),求dy 设y=e^cos^2*1/x,求dy xy^3-cos(x+y)=1,求dy y=cos(1-x的平方),求dy xy^3-cos(x+y)=1,求dy dy/dx=1-cos(y-x) 对于x=cos(y/x),求dy/dx. y= (cos x)^x,求dy/dx y=e^-x cos 3x,求dy. 设y=cos(x^2+e^x)求dy 已知y=cos(x+y),求dy 求 y=arctan 1/x 的微分dy 急 y=sin(3x+1),求dy.急