高数微分问题,x = 1 + t^2 y = cos t d^2y / d^2x = ( )_数学解答

高数微分问题,x = 1 + t^2 y = cos t d^2y / d^2x = ( )

人气：235 ℃　时间：2020-01-03 21:00:02

解答

dy/dx=dy/dt/dx/dt=-sint/2t,d^2y/dx^2=(dy/dx)/dt/dx/dt=(-2tcost+2sint)/8t^3