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

Question 46

Multiple Choice

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

A) - |cos x|
B) |cos x|
C) |cos 4x|
D) - |cos 4x|
E) - |cos 8x|

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