SOLUTION: Determine all solutions of the equation in radians. Find cos(x/2), given that sec x=4 and x terminates in 0<x<pi/2 I got sqr5/8 but how to get it to raidant

Algebra ->  Trigonometry-basics -> SOLUTION: Determine all solutions of the equation in radians. Find cos(x/2), given that sec x=4 and x terminates in 0<x<pi/2 I got sqr5/8 but how to get it to raidant      Log On


   

Question 923534: Determine all solutions of the equation in radians.
Find cos(x/2), given that sec x=4 and x terminates in 0 I got sqr5/8 but how to get it to raidant
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
cos(x/2) = 1/4 = .25
x/2 = 1.318
x = 2.636