If x = cos θ + i sin θ, then the value of \({x^n} + \frac{1}{{{x^n}}}\) is:

If x = cos θ + i sin θ, then the value of \({x^n} + \frac{1}{{{x^

1.	If x = cos θ + i sin θ, then the value of \({x^n} + \frac{1}{{{x^n}}}\) is:
A.	2 cos θ
B.	con nθ
C.	2 cos nθ
D.	2 sin nθ
Answer» D. 2 sin nθ