Sketch a graph of the function
f
(
x
)
=
2
sin
(
π
4
x
)
−
1
\displaystyle {f{{\left({x}\right)}}}={2}{\sin{{\left(\frac{\pi}{{4}}{x}\right)}}}-{1}
f
(
x
)
=
2
sin
(
4
π
x
)
−
1
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