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Consider the following graph.

Marlena Morrison. Created for Albert.io. Copyright 2016. All rights reserved.

Select the statements that correctly describe the graph above. Select ALL that apply.

$y=\text{ sin }x $

$y=-\text{ sin } x$

$y=\text{ cos } x$

$y=-\text{ cos }x $

The amplitude of the graph is $1$.

The amplitude of the graph is $2$.

The period of the graph is $π$.

The period of the graph is $2π$.