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$$$1 - u^{2}$$$ 的導數
您的輸入
求$$$\frac{d}{du} \left(1 - u^{2}\right)$$$。
解答
和/差的導數等於導數的和/差：
$${\color{red}\left(\frac{d}{du} \left(1 - u^{2}\right)\right)} = {\color{red}\left(\frac{d}{du} \left(1\right) - \frac{d}{du} \left(u^{2}\right)\right)}$$常數的導數為$$$0$$$：
$${\color{red}\left(\frac{d}{du} \left(1\right)\right)} - \frac{d}{du} \left(u^{2}\right) = {\color{red}\left(0\right)} - \frac{d}{du} \left(u^{2}\right)$$套用冪次法則 $$$\frac{d}{du} \left(u^{n}\right) = n u^{n - 1}$$$，取 $$$n = 2$$$：
$$- {\color{red}\left(\frac{d}{du} \left(u^{2}\right)\right)} = - {\color{red}\left(2 u\right)}$$因此，$$$\frac{d}{du} \left(1 - u^{2}\right) = - 2 u$$$。
答案
$$$\frac{d}{du} \left(1 - u^{2}\right) = - 2 u$$$A
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