Question

Помогите решить интеграл!
$\frac{1}{1 - \cos( \frac{x}{2} ) } dx$
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Answer 1

$\int {\frac{dx}{1-cos\frac{x}{2}}} = \int {\frac{dx}{2sin^2\frac{x}{4}} = 2\int {\frac{d(\frac{x}{4})}{sin^2\frac{x}{4}}} = -2ctg\frac{x}{4} + C.$