考研高等数学参数方程的导数问题
x=cos2v=1-2sin^2(2v)=1-2t^2
x两边的导数，1=-4t*dt/dx，dt/dx=-1/4t。
dy/dx=d(1+sint)/dx*[1+e^(1/(1+sint))]
=cost*dt/dx*[1+e^(1/(1+sint))]
=-cost/4t*[1+e^(1/(1+sint))]
x两边的导数，1=-4t*dt/dx，dt/dx=-1/4t。
dy/dx=d(1+sint)/dx*[1+e^(1/(1+sint))]
=cost*dt/dx*[1+e^(1/(1+sint))]
=-cost/4t*[1+e^(1/(1+sint))]