Write the Complex Number in Rectangular Form $\operatorname { cis } 210$

Write the complex number in rectangular form.
- $\operatorname { cis } 210$

A) $- \frac { 1 } { 2 } + \frac { - 1 } { 2 } \mathrm { i }$
B) $- \frac { \sqrt { 3 } } { 2 } + \frac { 1 } { 2 } i$
C) $- \frac { \sqrt { 3 } } { 2 } - \frac { 1 } { 2 } i$
D) $\frac { \sqrt { 3 } } { 2 } - \frac { 1 } { 2 } \mathrm { i }$

Correct Answer:

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