Question

how to start pls

Answer 1

\[\cos \theta + isin \theta=e^{i \theta }\]
\[\frac{ 9(\cos(11\pi/9)+isin(11\pi/9)) }{ 3\sqrt3\cos(\pi/4)+isin(\pi/4) }\]
\[=\sqrt3 e^{11i \pi /6-i \pi/4}\]
\[=\sqrt3 ^{19i \pi/12}\]