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6tan^(2)x-2cos^(2)x=cos2x if...

`6tan^(2)x-2cos^(2)x=cos2x` if

A

`cos2x=-1`

B

`cos2x=1`

C

`cos3x= -1//2`

D

`cos2x=1//2`

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The correct Answer is:
d
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