\[1+\cos 2x+\cos 4x+\cos 6x=\] [Roorkee 1974]

1.	\[1+\cos 2x+\cos 4x+\cos 6x=\] [Roorkee 1974]
A.	\[2\cos x\cos 2x\cos 3x\]
B.	\[4\sin x\,\cos 2x\cos 3x\]
C.	\[4\cos x\cos 2x\cos 3x\]
D.	None of these
Answer» D. None of these

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\[1+\cos 2x+\cos 4x+\cos 6x=\] [Roorkee 1974]

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