Write the Complex Number in Rectangular Form $$3 \left( \cos \frac { \pi } { 3 } + i \sin \frac { \pi } { 3 } \right)$$

Multiple Choice

Write the complex number in rectangular form.
- $$3 \left( \cos \frac { \pi } { 3 } + i \sin \frac { \pi } { 3 } \right)$$

A) $\frac { \sqrt { 3 } } { 6 } + \frac { \sqrt { 3 } } { 6 } \mathrm { i }$
B) $\sqrt { 3 } + \mathrm { i }$
C) $\frac { 3 } { 2 } + \frac { 3 \sqrt { 3 } } { 2 } \mathrm { i }$
D) $\frac { \sqrt { 3 } } { 2 } + \frac { 3 \sqrt { 3 } } { 2 } \mathrm { i }$