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If $2 \cos x + 2 \cos 3 x = \cos y, 2 \sin x + 2 \sin 3 x = \sin y$ then the value of $\cos 2 x$ of

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Correct option is A

cos⁡y=2×2cos ⁡2xcos ⁡xsin⁡y=2×2sin⁡2xcos⁡x ⇒1=cos2⁡y+sin2⁡y=16cos2⁡xSo cos⁡2x=2cos2⁡x−1=−7/8

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If 2cos⁡x+2cos⁡3x=cos⁡y,2sin⁡x+2sin⁡3x=sin⁡y then the value of cos⁡2x of

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If $2 \cos x + 2 \cos 3 x = \cos y, 2 \sin x + 2 \sin 3 x = \sin y$ then the value of $\cos 2 x$ of