Ответ (Неопределённый)
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| / 2 \ 2 / 2 \ 2 2
| 1 1 log(1 + sec(x)) log(-1 + sec(x)) log\1 + tan (x)/ sec (x)*log\1 + tan (x)/ sec (x)*log(1 + sec(x)) sec (x)*log(-1 + sec(x))
| ------- dx = C - -------------- + --------------- + ---------------- - ---------------- + ------------------------ - ----------------------- - ------------------------
| 3 2 2 2 2 2 2 2
| tan (x) -2 + 2*sec (x) -2 + 2*sec (x) -2 + 2*sec (x) -2 + 2*sec (x) -2 + 2*sec (x) -2 + 2*sec (x) -2 + 2*sec (x)
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$$-\log \sin x-{{1}\over{2\,\sin ^2x}}$$