Answer
$2+2i\sqrt 3$
Work Step by Step
$\cos 60^{\circ}=\frac{1}{2}$ and $\sin 60^{\circ}=\frac{\sqrt 3}{2}$
Substituting these values in the question,
$4(\cos 60^{\circ}+i\sin 60^{\circ})=4(\frac{1}{2}+i\frac{\sqrt 3}{2})=2+2i\sqrt 3$
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