Find Products of Complex Numbers in Polar Form
- A) $20 \left( \cos 30 ^ { \circ } + i \sin 30 ^ { \circ } \right)$

Multiple Choice

Find Products of Complex Numbers in Polar Form
- $$\begin{array} { l } z 1 = 5 \left( \cos 20 ^ { \circ } + i \sin 20 ^ { \circ } \right) \\z 2 = 4 \left( \cos 10 ^ { \circ } + i \sin 10 ^ { \circ } \right) \end{array}$$

A) $20 \left( \cos 30 ^ { \circ } + i \sin 30 ^ { \circ } \right)$
B) $20 \left( \cos 200 ^ { \circ } + i \sin 200 ^ { \circ } \right)$
C) $9 \left( \cos 30 ^ { \circ } + i \sin 30 ^ { \circ } \right)$
D) $9 \left( - \cos 200 ^ { \circ } - i \sin 200 ^ { \circ } \right)$