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Q.11 If 5(tan2x - cos2x) = 2cos2x +...
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Q.11 If 5(tan2x - cos2x) = 2cos2x + 9, then the value of cos4x is : [JEE Main -2017] (B) 2 (C)-7 (D) - 3 Sertion_R TICC Aduanandi
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option ( (c) ) is correct dear.
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