alleryStart learning →Using de Moivre's formula, what is (cos 30 + i sin 30) raised to the power 6, angles in degrees?
A-1
B1
Ci
D-i
Answer & Solution
Correct answer: A. -1
The argument becomes 6 times 30 = 180 degrees, giving cos 180 + i sin 180 = -1.
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