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Solve the Problem cos⁡θ2\cos \frac { \theta } { 2 }

Question 396

Multiple Choice

Solve the problem.
-Find cos⁡θ2\cos \frac { \theta } { 2 } , given that cos⁡θ=−35\cos \theta = - \frac { 3 } { 5 } and θ\theta terminates in 90∘<θ<180∘90 ^ { \circ } < \theta < 180 ^ { \circ } .


A) −55- \frac { \sqrt { 5 } } { 5 }

B) 3010\frac { \sqrt { 30 } } { 10 }

C) 55\frac { \sqrt { 5 } } { 5 }

D) −3010- \frac { \sqrt { 30 } } { 10 }

Correct Answer:

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