$$$2 \operatorname{atan}{\left(v \right)}$$$の導関数
関連する計算機: 対数微分計算機, 陰関数微分計算機(手順付き)
入力内容
$$$\frac{d}{dv} \left(2 \operatorname{atan}{\left(v \right)}\right)$$$ を求めよ。
解答
定数倍の法則 $$$\frac{d}{dv} \left(c f{\left(v \right)}\right) = c \frac{d}{dv} \left(f{\left(v \right)}\right)$$$ を $$$c = 2$$$ と $$$f{\left(v \right)} = \operatorname{atan}{\left(v \right)}$$$ に対して適用します:
$${\color{red}\left(\frac{d}{dv} \left(2 \operatorname{atan}{\left(v \right)}\right)\right)} = {\color{red}\left(2 \frac{d}{dv} \left(\operatorname{atan}{\left(v \right)}\right)\right)}$$逆正接関数の導関数は$$$\frac{d}{dv} \left(\operatorname{atan}{\left(v \right)}\right) = \frac{1}{v^{2} + 1}$$$:
$$2 {\color{red}\left(\frac{d}{dv} \left(\operatorname{atan}{\left(v \right)}\right)\right)} = 2 {\color{red}\left(\frac{1}{v^{2} + 1}\right)}$$したがって、$$$\frac{d}{dv} \left(2 \operatorname{atan}{\left(v \right)}\right) = \frac{2}{v^{2} + 1}$$$。
解答
$$$\frac{d}{dv} \left(2 \operatorname{atan}{\left(v \right)}\right) = \frac{2}{v^{2} + 1}$$$A