Represent the complex number graphically, and find the trigonometric form of the number.
-8i

A) $8 \left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)$
B) $8 ( \cos \pi - i \sin \pi )$
C) $8 \left( \cos \frac { 3 \pi } { 2 } - i \sin \frac { 3 \pi } { 2 } \right)$
D) $8 ( \cos \pi + i \sin \pi )$
E) $8 \left( \cos \frac { 3 \pi } { 2 } + i \sin \frac { 3 \pi } { 2 } \right)$

Question

Represent the complex number graphically, and find the trigonometric form of the number.  
-8i
 
A) $8 \left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)$ 
B) $8 ( \cos \pi - i \sin \pi )$ 
C) $8 \left( \cos \frac { 3 \pi } { 2 } - i \sin \frac { 3 \pi } { 2 } \right)$ 
D) $8 ( \cos \pi + i \sin \pi )$ 
E) $8 \left( \cos \frac { 3 \pi } { 2 } + i \sin \frac { 3 \pi } { 2 } \right)$

Quizplus · Accepted Answer

The Answer of Represent the complex number graphically, and find the trigonometric form of the number.  
-8i
 
A) $8 \left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)$ 
B) $8 ( \cos \pi - i \sin \pi )$ 
C) $8 \left( \cos \frac { 3 \pi } { 2 } - i \sin \frac { 3 \pi } { 2 } \right)$ 
D) $8 ( \cos \pi + i \sin \pi )$ 
E) $8 \left( \cos \frac { 3 \pi } { 2 } + i \sin \frac { 3 \pi } { 2 } \right)$

Represent the Complex Number Graphically, and Find the Trigonometric Form 8(cos⁡π2+isin⁡π2)8 \left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)8(cos2π​+isin2π​)

Represent the Complex Number Graphically, and Find the Trigonometric Form $8 \left( \cos \frac { \pi } { 2 } + i \sin \frac { \pi } { 2 } \right)$