Questão :. (18)

{(1/cossec x ( 1 cos x)} + cossec x ( 1 + cos x)

é igual a:.

A) 2sen x

B) 2 cos x

C) 2 cossec x

D) 2 tg x

E) 2 sec x


resolução completa por favor !!

VALENDO :. (25pts)

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