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

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) ​ $70 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)$

Correct Answer:

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