Integral dari $$$\frac{e^{\frac{x}{200}}}{2}$$$

Temukan $$$\int \frac{e^{\frac{x}{200}}}{2}\, dx$$$.

Terapkan aturan pengali konstanta $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ dengan $$$c=\frac{1}{2}$$$ dan $$$f{\left(x \right)} = e^{\frac{x}{200}}$$$:

$${\color{red}{\int{\frac{e^{\frac{x}{200}}}{2} d x}}} = {\color{red}{\left(\frac{\int{e^{\frac{x}{200}} d x}}{2}\right)}}$$

Misalkan $$$u=\frac{x}{200}$$$.

Kemudian $$$du=\left(\frac{x}{200}\right)^{\prime }dx = \frac{dx}{200}$$$ (langkah-langkah dapat dilihat di »), dan kita memperoleh $$$dx = 200 du$$$.

Jadi,

$$\frac{{\color{red}{\int{e^{\frac{x}{200}} d x}}}}{2} = \frac{{\color{red}{\int{200 e^{u} d u}}}}{2}$$

Terapkan aturan pengali konstanta $$$\int c f{\left(u \right)}\, du = c \int f{\left(u \right)}\, du$$$ dengan $$$c=200$$$ dan $$$f{\left(u \right)} = e^{u}$$$:

$$\frac{{\color{red}{\int{200 e^{u} d u}}}}{2} = \frac{{\color{red}{\left(200 \int{e^{u} d u}\right)}}}{2}$$

Integral dari fungsi eksponensial adalah $$$\int{e^{u} d u} = e^{u}$$$:

$$100 {\color{red}{\int{e^{u} d u}}} = 100 {\color{red}{e^{u}}}$$

Ingat bahwa $$$u=\frac{x}{200}$$$:

$$100 e^{{\color{red}{u}}} = 100 e^{{\color{red}{\left(\frac{x}{200}\right)}}}$$

Oleh karena itu,

$$\int{\frac{e^{\frac{x}{200}}}{2} d x} = 100 e^{\frac{x}{200}}$$

Tambahkan konstanta integrasi:

$$\int{\frac{e^{\frac{x}{200}}}{2} d x} = 100 e^{\frac{x}{200}}+C$$

$$$\int \frac{e^{\frac{x}{200}}}{2}\, dx = 100 e^{\frac{x}{200}} + C$$$A