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$$$1 - \phi$$$ 的導數
您的輸入
求$$$\frac{d}{d\phi} \left(1 - \phi\right)$$$。
解答
和/差的導數等於導數的和/差：
$${\color{red}\left(\frac{d}{d\phi} \left(1 - \phi\right)\right)} = {\color{red}\left(\frac{d}{d\phi} \left(1\right) - \frac{d}{d\phi} \left(\phi\right)\right)}$$套用冪次法則 $$$\frac{d}{d\phi} \left(\phi^{n}\right) = n \phi^{n - 1}$$$，取 $$$n = 1$$$，也就是 $$$\frac{d}{d\phi} \left(\phi\right) = 1$$$：
$$- {\color{red}\left(\frac{d}{d\phi} \left(\phi\right)\right)} + \frac{d}{d\phi} \left(1\right) = - {\color{red}\left(1\right)} + \frac{d}{d\phi} \left(1\right)$$常數的導數為$$$0$$$：
$${\color{red}\left(\frac{d}{d\phi} \left(1\right)\right)} - 1 = {\color{red}\left(0\right)} - 1$$因此，$$$\frac{d}{d\phi} \left(1 - \phi\right) = -1$$$。
答案
$$$\frac{d}{d\phi} \left(1 - \phi\right) = -1$$$A
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