First slide

Multiple and sub- multiple Angles

Question

If $0 < θ < π / 8,$ then $\sqrt{2 + \sqrt{2 + 2 \cos (4 θ)}}$ is equal to

Moderate

A

$2 \cos θ$
B

$- 2 \cos θ$
C

$2 \sin θ$
D

$- 2 \sin θ$

Solution

Use $1 + \cos 2 A = 2 \cos^{2} A$

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