Mathematics · Trigonometry

यदि 5(tan2x - cos2x) = 2cos 2x + 9 है, तो cos 4x का मान कितना है?

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यदि 5(tan2x - cos2x) = 2cos 2x + 9 है, तो cos 4x का मान कितना है?

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यदि 5(tan2x - cos2x) = 2cos 2x + 9 है, तो cos 4x का मान कितना है?

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