January 2020 1 61 Report
Sabendo que sen (x) = −1/2 com x pertencente ao terceiro quadrante, encontre cos(x) e tg (x).

Sabendo que cos(x) = −5/13 com x pertencente ao segundo quadrante, encontre sen(x) e tg (x).

Sabendo que cos(x) =1/3 com x ∈ [−π 2,0], encontre sen (x) e tg (x).
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