Multiply the Complex Numbers Below and Leave the Result in Trigonometric

question 98

Multiple Choice

Multiply the complex numbers below and leave the result in trigonometric form. $$\left[ 0.1 \left( \cos 260 ^ { \circ } + i \sin 260 ^ { \circ } \right) \right] \left[ 0.9 \left( \cos 220 ^ { \circ } + i \sin 220 ^ { \circ } \right) \right]$$ ​

• A) \(0.09 \left( \cos 120 ^ { \circ } + i \sin 120 ^ { \circ } \right)\)
• B)​ \(0.09 \left( \cos 120 ^ { \circ } + i \sin 40 ^ { \circ } \right)\)
• C)​ \(\cos 40 ^ { \circ } + i \sin 40 ^ { \circ }\)
• D)​ \(0.09 \left( \cos 40 ^ { \circ } + i \sin 40 ^ { \circ } \right)\)
• E)​ \(\cos 120 ^ { \circ } + i \sin 120 ^ { \circ }\)

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