(ii) z=32(cos7π6+isin7π6)z=\frac{3}{2}\left(\cos\frac{7\pi}{6}+i\sin\frac{7\pi}{6}\right)z=23(cos67π+isin67π) cos7π6=−32,sin7π6=−12\cos\frac{7\pi}{6}=-\frac{\sqrt{3}}{2},\quad \sin\frac{7\pi}{6}=-\frac{1}{2}cos67π=−23,sin67π=−21 z=32(−32−12i)=−334−34i\boxed{z=\frac{3}{2}\left(-\frac{\sqrt{3}}{2}-\frac{1}{2}i\right)=-\frac{3\sqrt{3}}{4}-\frac{3}{4}i}z=23(−23−21i)=−433−43i