Find the Product $( - 5 + 5 i ) ( 7 - 7 i )$

Multiple Choice

Find the product $( - 5 + 5 i ) ( 7 - 7 i )$ using trigonometric forms.Leave the result in trigonometric form.

A) $35 \left( \cos 135 ^ { \circ } + i \sin 135 ^ { \circ } \right)$
B) $70 \left( \cos 45 ^ { \circ } + i \sin 45 ^ { \circ } \right)$
C) $35 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)$
D) $70 \left( \cos 135 ^ { \circ } + i \sin 135 ^ { \circ } \right)$
E) $70 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)$