trigonometry

Question: $1+\cos 2x+\cos 4x+\cos 6x=$



1) $2\cos x\cos 2x\cos 3x$
2) $4\sin x\,\cos 2x\cos 3x$
3) $4\cos x\cos 2x\cos 3x$
4) None of these
Solution: Explanation: No Solution
Trigonometric ratios of sum and difference of two and three

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