Write the Complex Number in Polar Form $- 5 i$ A) $5 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)$

question 178

Multiple Choice

Write the complex number in polar form. Express the argument in degrees, rounded to the nearest tenth, if necessary.
- $- 5 i$

• A) \(5 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)\)
• B) \(5 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)\)
• C) \(5 \left( \cos 0 ^ { \circ } + \mathrm { i } \sin 0 ^ { \circ } \right)\)
• D) \(5 \left( \cos 270 ^ { \circ } + \mathrm { i } \sin 270 ^ { \circ } \right)\)

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