If x+1 x =2 , then x^3+1 x^3 = - Vidyadip

MCQ

If $x+\frac{1}{x}=2 \cos \theta$, then $x^3+\frac{1}{x^3}=$

A
$\cos 3 \theta$
B
$2 \cos 3 \theta$
C
$\frac{1}{2} \cos 3 \theta$
D
$\frac{1}{3} \cos 3 \theta$

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Answer

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