PART 12：進階微分公式(重要)(12:55)

1.乘法法則
\({\left( {f(x) \cdot g(x)} \right)^\prime } = f'(x) \cdot g(x) + f(x) \cdot g'(x)\)

2.除法法則
\({\left( {\frac{{f(x)}}{{g(x)}}} \right)^\prime } = \frac{{f'(x) \cdot g(x) - f(x) \cdot g'(x)}}{{{g^2}(x)}}\)

3.連鎖律(合成函數的導函數)
\({\left[ {f(g(x))} \right]^\prime } = f'(g(x)) \cdot g'(x)\)