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$$$u - 2$$$の導関数
入力内容
$$$\frac{d}{du} \left(u - 2\right)$$$ を求めよ。
解答
和/差の導関数は、導関数の和/差である:
$${\color{red}\left(\frac{d}{du} \left(u - 2\right)\right)} = {\color{red}\left(\frac{d}{du} \left(u\right) - \frac{d}{du} \left(2\right)\right)}$$定数の導数は$$$0$$$です:
$$- {\color{red}\left(\frac{d}{du} \left(2\right)\right)} + \frac{d}{du} \left(u\right) = - {\color{red}\left(0\right)} + \frac{d}{du} \left(u\right)$$$$$n = 1$$$ を用いて冪法則 $$$\frac{d}{du} \left(u^{n}\right) = n u^{n - 1}$$$ を適用すると、すなわち $$$\frac{d}{du} \left(u\right) = 1$$$:
$${\color{red}\left(\frac{d}{du} \left(u\right)\right)} = {\color{red}\left(1\right)}$$したがって、$$$\frac{d}{du} \left(u - 2\right) = 1$$$。
解答
$$$\frac{d}{du} \left(u - 2\right) = 1$$$A
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