Write the Complex Number in Trigonometric Form $Z = 3 ( \cos \pi - i \cos \pi )$

Write the complex number in trigonometric form.​ ​

A) $Z = 3 ( \cos \pi - i \cos \pi )$
B) ​ $Z = 3 ( \cos \pi + i \sin \pi )$
C) ​ $Z = - 3 ( \cos \pi + i \sin \pi )$
D) ​ $Z = 3 \left( \cos \frac { \pi } { 2 } - i \sin \frac { \pi } { 2 } \right)$
E) ​ $Z = 3 \left( \cos \frac { 3 \pi } { 2 } + i \sin \frac { 3 \pi } { 2 } \right)$

Correct Answer:

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