Write the Complex Number in Trigonometric Form R(c $$r ( \cos \theta + i \sin \theta )$$

question 78

Multiple Choice

Write the complex number in trigonometric form r(c $$r ( \cos \theta + i \sin \theta )$$ ) , with $$\theta$$ in the interval [0 $$\left[ 0 ^ { \circ } , 360 ^ { \circ } \right)$$
- $9 + 9 i$

• A) \(9 \sqrt { 2 } \left( \cos 315 ^ { \circ } + i \sin 315 ^ { \circ } \right)\)
• B) \(9 \sqrt { 2 } \left( \cos 135 ^ { \circ } + i \sin 135 ^ { \circ } \right)\)
• C) \(9 \sqrt { 2 } \left( \cos 225 ^ { \circ } + i \sin 225 ^ { \circ } \right)\)
• D) \(9 \sqrt { 2 } \left( \cos 45 ^ { \circ } + i \sin 45 ^ { \circ } \right)\)

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