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Identify each of the functions that have graphs with the following features.

$$amplitude = \cfrac{1}{2}$$
$$period = \cfrac{\pi}{4}$$

Select ALL that apply.

A

$y=\cfrac{1}{2} \cos \left( \cfrac{\pi}{4}x \right)$

B

$y=2\sin(8x)$

C

$y=\cfrac{1}{2}\tan(4x)$

D

$y=\cfrac{1}{2}\cos(8x)$

E

$y=\cfrac{1}{2}\cot(4x)$

F

$y=\cfrac{1}{2}\sin(4x)$

G

$y=2\cos(8x)$

H

$y=-\cfrac{1}{2}\sin(8x)$

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