If y = f(u) and u = g(x),where f and g are twice d
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解决时间 2021-02-19 16:29
- 提问者网友：别再叽里呱啦
- 2021-02-18 15:50
If y = f(u) and u = g(x),where f and g are twice d
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- 五星知识达人网友：执傲
- 2021-02-18 16:33
use chain rule.u=g(x) ==> dg/dx=du/dx=u'y=f(u) ==> df/dx=dy/du*du/dx=dy/du*u'd2y/dx2=d(df/dx)/dx=d(dy/du)/dx*u'+dy/du* du'/dx=d(dy/du)/du*du/dx*u'+dy/du*d2u/dx2=d2y/du2*du/dx*du/dx+dy/du*d2u/dx2另外twice differentiable functions意思是“二次可导函数”
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- 1楼网友：患得患失的劫
- 2021-02-18 18:04
你的回答很对
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