$$$x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$ 對 $$$x$$$ 的導數
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您的輸入
求$$$\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right)$$$。
解答
套用常數倍法則 $$$\frac{d}{dx} \left(c f{\left(x \right)}\right) = c \frac{d}{dx} \left(f{\left(x \right)}\right)$$$，使用 $$$c = \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$ 與 $$$f{\left(x \right)} = x^{2}$$$：
$${\color{red}\left(\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right)\right)} = {\color{red}\left(\cos^{2}{\left(\tanh{\left(\eta \right)} \right)} \frac{d}{dx} \left(x^{2}\right)\right)}$$套用冪次法則 $$$\frac{d}{dx} \left(x^{n}\right) = n x^{n - 1}$$$，取 $$$n = 2$$$：
$$\cos^{2}{\left(\tanh{\left(\eta \right)} \right)} {\color{red}\left(\frac{d}{dx} \left(x^{2}\right)\right)} = \cos^{2}{\left(\tanh{\left(\eta \right)} \right)} {\color{red}\left(2 x\right)}$$因此，$$$\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right) = 2 x \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$。
答案
$$$\frac{d}{dx} \left(x^{2} \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}\right) = 2 x \cos^{2}{\left(\tanh{\left(\eta \right)} \right)}$$$A