Solve the Problem $\cos \frac { \theta } { 2 }$

question 335

Multiple Choice

Solve the problem.
-Find $\cos \frac { \theta } { 2 }$ , given that $\sec \theta = 4$ and $\theta$ terminates in $0 < \theta < \pi / 2$ .

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

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