If 3 cos x+2 cos 3 x=cos y, 3 sin x+2 sin 3 x=sin y, then the value of cos 2 x is (A) -1 (B) 1/8 ...

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If 3 cos x+2 cos 3 x=cos y, 3 sin x+2 sin 3 x=sin y, then the value of cos 2 x is
(A) -1
(B) 1/8
(C) -1/8
(D) 7/8

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