Mathematics · Trigonometry

If 5(tan2x - cos2x) = 2cos 2x + 9, then the value of cos 4x is:

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If 5(tan2x - cos2x) = 2cos 2x + 9, then the value of cos 4x is:

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If 5(tan2x - cos2x) = 2cos 2x + 9, then the value of cos 4x is:

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