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