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Find the Exact Value by Using a Half-Angle Identity $\cos 75 ^ { \circ }$

Question 127

Multiple Choice

Find the exact value by using a half-angle identity.
- $\cos 75 ^ { \circ }$

A) $\frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }$
B) $- \frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }$
C) $\frac { 1 } { 2 } \sqrt { 2 + \sqrt { 3 } }$
D) $- \frac { 1 } { 2 } \sqrt { 2 + \sqrt { 3 } }$

Find the Exact Value by Using a Half-Angle Identity cos⁡75∘\cos 75 ^ { \circ }cos75∘

Multiple Choice

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Find the Exact Value by Using a Half-Angle Identity $\cos 75 ^ { \circ }$

Correct Answer:
Verified
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