$$$\frac{\sin^{2}{\left(2 \right)}}{x}$$$ 的積分
您的輸入
求$$$\int \frac{\sin^{2}{\left(2 \right)}}{x}\, dx$$$。
解答
套用常數倍法則 $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$，使用 $$$c=\sin^{2}{\left(2 \right)}$$$ 與 $$$f{\left(x \right)} = \frac{1}{x}$$$：
$${\color{red}{\int{\frac{\sin^{2}{\left(2 \right)}}{x} d x}}} = {\color{red}{\sin^{2}{\left(2 \right)} \int{\frac{1}{x} d x}}}$$
$$$\frac{1}{x}$$$ 的積分是 $$$\int{\frac{1}{x} d x} = \ln{\left(\left|{x}\right| \right)}$$$：
$$\sin^{2}{\left(2 \right)} {\color{red}{\int{\frac{1}{x} d x}}} = \sin^{2}{\left(2 \right)} {\color{red}{\ln{\left(\left|{x}\right| \right)}}}$$
因此，
$$\int{\frac{\sin^{2}{\left(2 \right)}}{x} d x} = \ln{\left(\left|{x}\right| \right)} \sin^{2}{\left(2 \right)}$$
加上積分常數：
$$\int{\frac{\sin^{2}{\left(2 \right)}}{x} d x} = \ln{\left(\left|{x}\right| \right)} \sin^{2}{\left(2 \right)}+C$$
答案
$$$\int \frac{\sin^{2}{\left(2 \right)}}{x}\, dx = \ln\left(\left|{x}\right|\right) \sin^{2}{\left(2 \right)} + C$$$A