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Kalkulator Diferensiasi Logaritmik

Hitung turunan langkah demi langkah menggunakan logaritma

Kalkulator online akan menghitung turunan dari fungsi apa pun menggunakan diferensiasi logaritmik, dengan menampilkan langkah-langkahnya. Selain itu, kalkulator akan mengevaluasi turunan pada titik yang diberikan jika diperlukan.

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Masukan Anda

Temukan $$$\frac{d}{dx} \left(x^{\sin{\left(x \right)}}\right)$$$.

Solusi

Misalkan $$$H{\left(x \right)} = x^{\sin{\left(x \right)}}$$$.

Ambil logaritma pada kedua ruas: $$$\ln\left(H{\left(x \right)}\right) = \ln\left(x^{\sin{\left(x \right)}}\right)$$$

Tulis ulang ruas kanan menggunakan sifat-sifat logaritma: $$$\ln\left(H{\left(x \right)}\right) = \ln\left(x\right) \sin{\left(x \right)}$$$.

Diferensiasikan secara terpisah kedua sisi persamaan: $$$\frac{d}{dx} \left(\ln\left(H{\left(x \right)}\right)\right) = \frac{d}{dx} \left(\ln\left(x\right) \sin{\left(x \right)}\right)$$$.

Turunkan ruas kiri dari persamaan.

Fungsi $$$\ln\left(H{\left(x \right)}\right)$$$ merupakan komposisi $$$f{\left(g{\left(x \right)} \right)}$$$ dari dua fungsi $$$f{\left(u \right)} = \ln\left(u\right)$$$ dan $$$g{\left(x \right)} = H{\left(x \right)}$$$.

Terapkan aturan rantai $$$\frac{d}{dx} \left(f{\left(g{\left(x \right)} \right)}\right) = \frac{d}{du} \left(f{\left(u \right)}\right) \frac{d}{dx} \left(g{\left(x \right)}\right)$$$:

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

Turunan dari logaritma natural adalah $$$\frac{d}{du} \left(\ln\left(u\right)\right) = \frac{1}{u}$$$:

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

Kembalikan ke variabel semula:

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

Dengan demikian, $$$\frac{d}{dx} \left(\ln\left(H{\left(x \right)}\right)\right) = \frac{\frac{d}{dx} \left(H{\left(x \right)}\right)}{H{\left(x \right)}}$$$.

Turunkan ruas kanan persamaan.

Terapkan aturan hasil kali $$$\frac{d}{dx} \left(f{\left(x \right)} g{\left(x \right)}\right) = \frac{d}{dx} \left(f{\left(x \right)}\right) g{\left(x \right)} + f{\left(x \right)} \frac{d}{dx} \left(g{\left(x \right)}\right)$$$ pada $$$f{\left(x \right)} = \ln\left(x\right)$$$ dan $$$g{\left(x \right)} = \sin{\left(x \right)}$$$:

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

Turunan dari logaritma natural adalah $$$\frac{d}{dx} \left(\ln\left(x\right)\right) = \frac{1}{x}$$$:

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

Turunan fungsi sinus adalah $$$\frac{d}{dx} \left(\sin{\left(x \right)}\right) = \cos{\left(x \right)}$$$:

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

Dengan demikian, $$$\frac{d}{dx} \left(\ln\left(x\right) \sin{\left(x \right)}\right) = \ln\left(x\right) \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x}$$$.

Dengan demikian, $$$\frac{\frac{d}{dx} \left(H{\left(x \right)}\right)}{H{\left(x \right)}} = \ln\left(x\right) \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x}$$$.

Oleh karena itu, $$$\frac{d}{dx} \left(H{\left(x \right)}\right) = \left(\ln\left(x\right) \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x}\right) H{\left(x \right)} = x^{\sin{\left(x \right)} - 1} \left(x \ln\left(x\right) \cos{\left(x \right)} + \sin{\left(x \right)}\right).$$$

Jawaban

$$$\frac{d}{dx} \left(x^{\sin{\left(x \right)}}\right) = x^{\sin{\left(x \right)} - 1} \left(x \ln\left(x\right) \cos{\left(x \right)} + \sin{\left(x \right)}\right)$$$A


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Catatan Terkait: Logarithmic Differentiation