sin(ln(x)) 的導數

此計算器將求出 $$$\sin{\left(\ln\left(x\right) \right)}$$$ 的導數，並顯示步驟。

您的輸入

求$$$\frac{d}{dx} \left(\sin{\left(\ln\left(x\right) \right)}\right)$$$。

解答

函數 $$$\sin{\left(\ln\left(x\right) \right)}$$$ 是兩個函數 $$$f{\left(u \right)} = \sin{\left(u \right)}$$$ 與 $$$g{\left(x \right)} = \ln\left(x\right)$$$ 之複合 $$$f{\left(g{\left(x \right)} \right)}$$$。

應用鏈式法則 $$$\frac{d}{dx} \left(f{\left(g{\left(x \right)} \right)}\right) = \frac{d}{du} \left(f{\left(u \right)}\right) \frac{d}{dx} \left(g{\left(x \right)}\right)$$$：

$${\color{red}\left(\frac{d}{dx} \left(\sin{\left(\ln\left(x\right) \right)}\right)\right)} = {\color{red}\left(\frac{d}{du} \left(\sin{\left(u \right)}\right) \frac{d}{dx} \left(\ln\left(x\right)\right)\right)}$$

正弦函數的導數為$$$\frac{d}{du} \left(\sin{\left(u \right)}\right) = \cos{\left(u \right)}$$$：

$${\color{red}\left(\frac{d}{du} \left(\sin{\left(u \right)}\right)\right)} \frac{d}{dx} \left(\ln\left(x\right)\right) = {\color{red}\left(\cos{\left(u \right)}\right)} \frac{d}{dx} \left(\ln\left(x\right)\right)$$

返回原變數：

$$\cos{\left({\color{red}\left(u\right)} \right)} \frac{d}{dx} \left(\ln\left(x\right)\right) = \cos{\left({\color{red}\left(\ln\left(x\right)\right)} \right)} \frac{d}{dx} \left(\ln\left(x\right)\right)$$

自然對數的導數為 $$$\frac{d}{dx} \left(\ln\left(x\right)\right) = \frac{1}{x}$$$：

$$\cos{\left(\ln\left(x\right) \right)} {\color{red}\left(\frac{d}{dx} \left(\ln\left(x\right)\right)\right)} = \cos{\left(\ln\left(x\right) \right)} {\color{red}\left(\frac{1}{x}\right)}$$

因此，$$$\frac{d}{dx} \left(\sin{\left(\ln\left(x\right) \right)}\right) = \frac{\cos{\left(\ln\left(x\right) \right)}}{x}$$$。

答案

$$$\frac{d}{dx} \left(\sin{\left(\ln\left(x\right) \right)}\right) = \frac{\cos{\left(\ln\left(x\right) \right)}}{x}$$$A

Please try a new game Rotatly