If \( x^{2}-2 x \cos \theta+1=0 \), then \( x^{2 n}-2 x^{n} \cos n \theta+1 \) is equal to (A) \...
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1If \( x^{2}-2 x \cos \theta+1=0 \), then \( x^{2 n}-2 x^{n} \cos n \theta+1 \) is equal to
(A) \( \cos 2 n \theta \)
(B) \( \sin 2 n \theta \)
(C) \( \cos n \theta \)
(D) undefined
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