Integral dari $$$8 \ln\left(e^{2}\right) - \ln\left(e^{12}\right)$$$

Temukan $$$\int \left(8 \ln\left(e^{2}\right) - \ln\left(e^{12}\right)\right)\, de$$$.

Masukan ditulis ulang: $$$\int{\left(8 \ln{\left(e^{2} \right)} - \ln{\left(e^{12} \right)}\right)d e}=\int{4 \ln{\left(e \right)} d e}$$$.

Terapkan aturan pengali konstanta $$$\int c f{\left(e \right)}\, de = c \int f{\left(e \right)}\, de$$$ dengan $$$c=4$$$ dan $$$f{\left(e \right)} = \ln{\left(e \right)}$$$:

$${\color{red}{\int{4 \ln{\left(e \right)} d e}}} = {\color{red}{\left(4 \int{\ln{\left(e \right)} d e}\right)}}$$

Untuk integral $$$\int{\ln{\left(e \right)} d e}$$$, gunakan integrasi parsial $$$\int \operatorname{u} \operatorname{dv} = \operatorname{u}\operatorname{v} - \int \operatorname{v} \operatorname{du}$$$.

Misalkan $$$\operatorname{u}=\ln{\left(e \right)}$$$ dan $$$\operatorname{dv}=de$$$.

Maka $$$\operatorname{du}=\left(\ln{\left(e \right)}\right)^{\prime }de=\frac{de}{e}$$$ (langkah-langkah dapat dilihat di ») dan $$$\operatorname{v}=\int{1 d e}=e$$$ (langkah-langkah dapat dilihat di »).

Integral tersebut dapat ditulis ulang sebagai

$$4 {\color{red}{\int{\ln{\left(e \right)} d e}}}=4 {\color{red}{\left(\ln{\left(e \right)} \cdot e-\int{e \cdot \frac{1}{e} d e}\right)}}=4 {\color{red}{\left(e \ln{\left(e \right)} - \int{1 d e}\right)}}$$

Terapkan aturan konstanta $$$\int c\, de = c e$$$ dengan $$$c=1$$$:

$$4 e \ln{\left(e \right)} - 4 {\color{red}{\int{1 d e}}} = 4 e \ln{\left(e \right)} - 4 {\color{red}{e}}$$

Oleh karena itu,

$$\int{4 \ln{\left(e \right)} d e} = 4 e \ln{\left(e \right)} - 4 e$$

Sederhanakan:

$$\int{4 \ln{\left(e \right)} d e} = 4 e \left(\ln{\left(e \right)} - 1\right)$$

Tambahkan konstanta integrasi:

$$\int{4 \ln{\left(e \right)} d e} = 4 e \left(\ln{\left(e \right)} - 1\right)+C$$

$$$\int \left(8 \ln\left(e^{2}\right) - \ln\left(e^{12}\right)\right)\, de = 4 e \left(\ln\left(e\right) - 1\right) + C$$$A