Write the Complex Number in Trigonometric Form $$r ( \cos \theta + i \sin \theta )$$

Multiple Choice

Write the complex number in trigonometric form $$r ( \cos \theta + i \sin \theta )$$ with θ in the interval [0°, 360°) .
- $3 \sqrt { 3 } - 3 i$

A) $6 \left( \cos 330 ^ { \circ } + i \sin 330 ^ { \circ } \right)$
B) $6 \left( \cos 60 ^ { \circ } + i \sin 60 ^ { \circ } \right)$
C) $6 \left( \cos 300 ^ { \circ } + i \sin 300 ^ { \circ } \right)$
D) $6 \left( \cos 30 ^ { \circ } + i \sin 30 ^ { \circ } \right)$