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Find the Exact Value by Using a Half-Angle Identity $\sin 22.5 ^ { \circ }$

Question 136

Multiple Choice

Find the exact value by using a half-angle identity.
- $\sin 22.5 ^ { \circ }$

A) $\frac { 1 } { 2 } \sqrt { 2 - \sqrt { 2 } }$
B) $- \frac { 1 } { 2 } \sqrt { 2 - \sqrt { 2 } }$
C) $- \frac { 1 } { 2 } \sqrt { 2 + \sqrt { 2 } }$
D) $\frac { 1 } { 2 } \sqrt { 2 + \sqrt { 2 } }$

Find the Exact Value by Using a Half-Angle Identity sin⁡22.5∘\sin 22.5 ^ { \circ }sin22.5∘

Multiple Choice

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Find the Exact Value by Using a Half-Angle Identity $\sin 22.5 ^ { \circ }$

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