Perform the Operation and Leave the Result in Trigonometric Form $\left( \cos 7 ^ { \circ } + i \sin 7 ^ { \circ } \right) \left( \cos 24 ^ { \circ } + i \sin 24 ^ { \circ } \right)$

Multiple Choice

Perform the operation and leave the result in trigonometric form. $\left( \cos 7 ^ { \circ } + i \sin 7 ^ { \circ } \right) \left( \cos 24 ^ { \circ } + i \sin 24 ^ { \circ } \right)$

A) cos 17° - isin 17°
B) cos 31° - isin 31°
C) cos 17° + isin 17°
D) cos 31° + icos 31°
E) cos 31° + isin 31°