Compute (cos θ + i sin θ)^3 using De Moivre’s theorem.

Compute (cos θ + i sin θ)^3 using De Moivre’s theorem.

A cos 3θ − i sin 3θ

B cos 3θ + i sin 3θ

C cos θ + i sin θ

D 3(cos θ + i sin θ)

Solution

Correct Answer: Option B