作者GBRS ()
看板trans_math
标题Re: [微分]
时间Wed Jan 24 00:23:46 2007
※ 引述《king911015 (早已放弃爱上你)》之铭言：
: Given x= t+e^t, y=t+t^2, find the value of d^2y/dx^2 when t=0.
d^2y/dx^2
=d/dx(dy/dx)
先将dy/dx拆成(dy/dt)/(dx/dt)
算出为t的函数,假设为f(t)
同样再拆成{d[f(t)]/dt}/(dx/dt)即可...
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