I really need help with trig????????

0 ⤊

Find the exact values for the following.

a) cos 7pi/6.

b) sec(x) = 2 / (sqrt 3) for 0<-x<-pi

2007-04-29 06:09:14 · 2 answers · asked by Hamza 1 in Science & Mathematics ➔ Mathematics

cos 7pi/6
=cos210=-cos30=-sqrt(3)/2

1/cosx=2/sqrt(3)

2cosx=sqrt(3)
cosx=sqrt(3)/2
x=30=pi/6

x=150=5*pi/6

2007-04-29 06:14:44 · answer #1 · answered by iyiogrenci 6 · 0⤊ 0⤋

a) = - cos pi/6 = -sqrt(3)/2

b) cosx = sqrt(3)/2, x = pi/6

2007-04-29 13:12:17 · answer #2 · answered by hustolemyname 6 · 0⤊ 0⤋