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

question 231

Multiple Choice

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) \(8 \left( \cos \frac { 3 \pi } { 2 } + i \sin \frac { 3 \pi } { 2 } \right)\)

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