Question

Using DeMoivre's Theorem, what is the value of
[3(cos60* + i sin 60*)]?

Answer 1

this is not demoivre, this is a direct calculation

Answer 2

\[\cos(60)=\frac{1}{2}, \sin(60)=\frac{\sqrt{3}}{2}\] and so you have
\[\frac{3}{2}+\frac{3\sqrt{3}}{2}i\]

Answer 3

if you wanted to for example raise this number to the power of 3, then you would use demoivre