Answer
$sin(4x)$,
$4sin(x)$,
See graph.
Work Step by Step
Step 1. Given $f(x)=sin(x)$ and $g(x)=4x$, we have: $(f\circ g)(x)=f(g(x))=sin(4x)$,
Step 2. $(g\circ f)(x)=g(f(x))=4sin(x)$,
Step 3. See graph.
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