Perform the indicated operation. Give answers in rectangular form expressing real and imaginary parts to four decimal places.[5(cos 20° + i sin 20°)][4(cos 10° + i sin 10°)]
A. 17.3205 + 10.0000i
B. 0.5000 + 0.8660i
C. 0.8660 + 0.5000i
D. 10.0000 + 17.3205i
Answer: A
Mathematics
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