Use the Information Given About the Angle θ, 0 ≤θ $\sec \theta = 4 , \quad 0 < \theta < \frac { \pi } { 2 }$

Multiple Choice

Use the information given about the angle θ, 0 ≤θ ≤ 2π, to find the exact value of the indicated trigonometric function.
- $\sec \theta = 4 , \quad 0 < \theta < \frac { \pi } { 2 }$
Find $\cos \frac { \theta } { 2 }$ .

A) $\frac { \sqrt { 8 - 2 \sqrt { 15 } } } { 4 }$

B) $\frac { \sqrt { 6 } } { 4 }$

C) $\frac { \sqrt { 10 } } { 4 }$

D) $\frac { \sqrt { 8 + 2 \sqrt { 15 } } } { 4 }$