(a)Without using a graphing utility, specify the amplitude and the period for $y=2 \sin \pi x$ and for $y=\sin 2 \pi x$
(b) Check your answers in part (a) by graphing the two functions. (Use a viewing rectangle that extends from 0 to 2 in the $x$ -direction and from $-2$ to 2 in the $y$ -direction.
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