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1+ cos 2x + cos 4 x+ cos 6x- 4 cos x cos...

`1+ cos 2x + cos 4 x+ cos 6x- 4 cos x cos 2x cos 3x = `

A

`1`

B

`-1`

C

`2`

D

`0`

Text Solution

Verified by Experts

The correct Answer is:
D
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