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[" If "5(tan^(2)x-cos^(2)x)=,2cos2x+9," ...

[" If "5(tan^(2)x-cos^(2)x)=,2cos2x+9," then the "],[" value of "cos4x" is ",[" JEE (Main) "2017]],[[" (A) "-(7)/(9)," (B) "-(3)/(5)],[" (C) "(1)/(3)," (D) "(2)/(9)]]

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