(iv) z1z2\dfrac{z_1}{z_2}z2z1 z1z2=711(cosπ+isinπ)=711(−1+0i)\frac{z_1}{z_2}=\frac{7}{11}(\cos\pi+i\sin\pi)=\frac{7}{11}(-1+0i)z2z1=117(cosπ+isinπ)=117(−1+0i) z1z2=−711+0i\boxed{\frac{z_1}{z_2}=-\frac{7}{11}+0i}z2z1=−117+0i