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Use the Half-Angle Formula to Simplify the Given Expression $\sqrt { \frac { 1 + \cos 8 x } { 2 } }$

Question 9

Multiple Choice

Use the half-angle formula to simplify the given expression. $\sqrt { \frac { 1 + \cos 8 x } { 2 } }$

A) cos |2x|
B) cos |8x|
C) cos |16x|
D) cos |32x|
E) cos |4x|

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