Помогите доделать интеграл, пример: [tex]\int\limits {\frac{dx}{sin^4x*cos^2x} } = \int\limits {\frac{\\dx}{cos^2x} }*\frac{1}{(sin^2x)^2} = \left \{ {{t=tg x[/tex]. Ответ должен быть: [tex]tg x-2ctg x - \frac{1}{3} ctg^3x+ C[/tex]
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