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

question 396

Multiple Choice

Solve the problem.
-Find $\cos \frac { \theta } { 2 }$ , given that $\cos \theta = - \frac { 3 } { 5 }$ and $\theta$ terminates in $90 ^ { \circ } < \theta < 180 ^ { \circ }$ .

• A) \(- \frac { \sqrt { 5 } } { 5 }\)
• B) \(\frac { \sqrt { 30 } } { 10 }\)
• C) \(\frac { \sqrt { 5 } } { 5 }\)
• D) \(- \frac { \sqrt { 30 } } { 10 }\)

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