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De Moivre's formula gives (cos t + i sin t) to the power n as
Acos t + i sin t
Bcos t^n + i sin t^n
Cn cos t + i n sin t
Dcos nt + i sin nt
Answer & Solution
Correct answer: D. cos nt + i sin nt
Repeated multiplication adds the argument n times, giving angle nt with modulus 1.
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