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The graph of $y = \sin x$ is given below.

Which of the following changes in the equation will increase the amplitude of the graph?

$ y = \sin 2x $

$ y = 2 \sin x $

$ y = \sin \left(\cfrac{x}{2}\right) $

$ y = (\sin x) (\sin x) $

$ y = \sin (x)(x) $