Question

Sabendo-se que senx= -1/2 e 3pi/2《x《2pi calcule
A)cos x
B)tg x
C)cot x
D)sec x
E)cossec x

Answer 1

Sabendo-se que senx= -1/2 e 3pi/2《x《2pi calcule

sen^2(x) + cos^2(x) = 1

cos^2(x) = 4/4 - 1/4 = 3/4

cos(x) = √3/2

A)cos x  = √3/2

B)tg x  = -√3/3

C)cot x  = -√3

D)sec x  = 2√3/3

E)cossec x  = -2