코탄젠트cotangent
적분 공식 증명.
$\displaystyle \int\cot xdx$
$\displaystyle =\int\frac{\cos x}{\sin x}dx$
$\displaystyle =\int\frac{(\sin x)'}{\sin x}dx$
$\displaystyle =\ln|\sin x|+C$
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last modified 2021-12-19 04:25:19