Помогите решить интеграл, пример: [tex]\int\limits {\frac{dx}{1+3cosx} }[/tex]. Ответ: [tex]-\frac{1}{2\sqrt{2} } ln|\frac{tg\frac{x}{2}-\sqrt{2} }{tg\frac{x}{2}+\sqrt{2} } | + C[/tex]
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