$$$x$$$ に関する $$$x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$ 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
$$$\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right)$$$ を求めよ。
解答
定数倍の法則 $$$\frac{d}{dx} \left(c f{\left(x \right)}\right) = c \frac{d}{dx} \left(f{\left(x \right)}\right)$$$ を $$$c = \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$ と $$$f{\left(x \right)} = x^{2}$$$ に対して適用します:
$${\color{red}\left(\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right)\right)} = {\color{red}\left(\cos^{2}{\left(\tanh{\left(\eta \right)} \right)} \frac{d}{dx} \left(x^{2}\right)\right)}$$冪法則 $$$\frac{d}{dx} \left(x^{n}\right) = n x^{n - 1}$$$ を $$$n = 2$$$ に対して適用する:
$$\cos^{2}{\left(\tanh{\left(\eta \right)} \right)} {\color{red}\left(\frac{d}{dx} \left(x^{2}\right)\right)} = \cos^{2}{\left(\tanh{\left(\eta \right)} \right)} {\color{red}\left(2 x\right)}$$したがって、$$$\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right) = 2 x \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$。
解答
$$$\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right) = 2 x \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$A