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