ITA 2009 — Questão 17

$[\cos x - \operatorname{sen}^2 x] \cotg x$.

$[\operatorname{sen} x + \cos x] \tg x$.

$[\cos^2 x - \operatorname{sen} x] \cotg^2 x$.

$[1 - \cotg^2 x] \operatorname{sen} x$.

$[1 + \cotg^2 x] [\operatorname{sen} x + \cos x]$.