Question

Dado sen x= 2/3 , a cossec x vale: 

A) 2/3

B) 3/2

C) 5/4

D) 1

E) 0

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Answer 1

cossec(a) = 1/sen(a)

cossec(x) = 1/(2/3)

cossec(x) = 3/2

Resposta: B) 3/2