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Complete the Identity sin⁡2θ2=?\sin ^ { 2 } \frac { \theta } { 2 } = ?

Question 145

Multiple Choice

Complete the identity.
- sin⁡2θ2=?\sin ^ { 2 } \frac { \theta } { 2 } = ?


A) sec⁡θ−12sec⁡θ\frac { \sec \theta - 1 } { 2 \sec \theta }
B) sec⁡θ+12sec⁡θ\frac { \sec \theta + 1 } { 2 \sec \theta }
C) −sec⁡θ−12sec⁡θ\frac { - \sec \theta - 1 } { 2 \sec \theta }
D) −sec⁡θ+12sec⁡θ\frac { - \sec \theta + 1 } { 2 \sec \theta }

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