Ответ (Неопределённый)
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| 3 7 5
| 1 cos(x) cos (x) cos (x) cos (x)
| 1*------- dx = C + x + ------ - --------- - --------- + ---------
| 8 sin(x) 3 7 5
| tan (x) 3*sin (x) 7*sin (x) 5*sin (x)
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$$\int 1 \cdot \frac{1}{\tan^{8}{\left(x \right)}}\, dx = C + x + \frac{\cos{\left(x \right)}}{\sin{\left(x \right)}} - \frac{\cos^{3}{\left(x \right)}}{3 \sin^{3}{\left(x \right)}} + \frac{\cos^{5}{\left(x \right)}}{5 \sin^{5}{\left(x \right)}} - \frac{\cos^{7}{\left(x \right)}}{7 \sin^{7}{\left(x \right)}}$$