17请问这道高数题目，答案的t是怎么化过去的，没看懂，求大佬详细解释，谢谢啦
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y=tf'(t)-f(t)
dy/dt = tf''(t) +f'(t) -f'(t) = tf''(t)
x=f'(t)
dx/dt =f''(t)
dy/dx = (dy/dt)/(dx/dt) = tf''(t)/f''(t) =t
d/dt (dy/dx) =1
d^2y/dx^2
=d/dt (dy/dx) / (dx/dt)
=1/f''(t)
dy/dt = tf''(t) +f'(t) -f'(t) = tf''(t)
x=f'(t)
dx/dt =f''(t)
dy/dx = (dy/dt)/(dx/dt) = tf''(t)/f''(t) =t
d/dt (dy/dx) =1
d^2y/dx^2
=d/dt (dy/dx) / (dx/dt)
=1/f''(t)
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