复合函数求导公式是如何推导出来的?设y=f(u),u=g(x)则f'(u)= ( f(u+du) - f(u) ) / du du = dg(x) = g'(x)dx则原式= f'(u)= ( f(u+du) - f(u) ) / g'(x)dx f'(u)g'(x) = ( f(u+du) - f(u) ) /dx =
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