Write the Expression in the Standard Form a + Bi $\left[ 2 \left( \cos 15 ^ { \circ } + i \sin 15 ^ { \circ } \right) \right] ^ { 3 }$

Multiple Choice

Write the expression in the standard form a + bi.
- $\left[ 2 \left( \cos 15 ^ { \circ } + i \sin 15 ^ { \circ } \right) \right] ^ { 3 }$

A) $3 + 3 \mathrm { i }$
B) $4 \sqrt { 2 } + 4 \sqrt { 2 } \mathrm { i }$
C) $3 \sqrt { 2 } + 3 \sqrt { 2 } \mathrm { i }$
D) $4 + 4 \mathrm { i }$