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

[" 14.If "5(tan^(2)x-cos^(2)x)=2cos2x+9" ,then the value of "cos4x" is: "],[[" (a) "1," (b) "(2)/(a)," (c) "-(7)/(9)]]

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