Question

Sabendo que cos x = 4/5,com 3pi/2 menor ou igual a x e menor ou igual a 2pi,calcule

a)sen x
b)tg x
c)sec x
d) cossec x
e) cotg x​

Answer 1

a)sen x =√1-cos²x= √1 -(16/25)= √9/25= -3/5

b)tg x = senx/cosx = -3/5 / 4/5 = -3/4

c)sec x = 1/cosx = 5/4

d) cossec x = 1/senx = -5/3

e) cotg x = 1/tgx = -4/3