设参数函数x=ln(1+t^2),y=t-arctant.求(d^2y)/(dx^2).另外,如果求dy/dx^2,d^2y/dx又怎样算?

问题描述:

设参数函数x=ln(1+t^2),y=t-arctant.求(d^2y)/(dx^2).
另外,如果求dy/dx^2,d^2y/dx又怎样算?