Determine All Solutions of the Equation in Radians $\cos \frac { x } { 2 }$

question 90

Multiple Choice

Determine all solutions of the equation in radians.
-Find $\cos \frac { x } { 2 }$ , given that $\cos x = \frac { 1 } { 4 }$ and $x$ terminates in $0 < x < \frac { \pi } { 2 }$ .

• A) \(\frac { \sqrt { 10 } } { 4 }\)
• B) \(\frac { \sqrt { 8 + 2 \sqrt { 15 } } } { 4 }\)
• C) \(\frac { \sqrt { 6 } } { 4 }\)
• D) \(\frac { \sqrt { 8 - 2 \sqrt { 15 } } } { 4 }\)