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$6 \tan^{2} â¡ x â 2 \cos^{2} â¡ x = \cos â¡ 2 x$ if

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cosâ¡2x=â1

cosâ¡2x=1

cosâ¡3x=â1/2

cosâ¡2x=1/2

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detailed solution

Correct option is D

6sin2â¡xâ2cos4â¡x=cos2â¡x2cos2â¡xâ1â4cos4â¡x+5cos2â¡xâ6=0âcos2â¡x=3/4=cosâ¡2x=1/2

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6tan2â¡xâ2cos2â¡x=cosâ¡2x if

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$6 \tan^{2} â¡ x â 2 \cos^{2} â¡ x = \cos â¡ 2 x$ if