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

[" 7.If "5(tan^(2)x-cos^(2)x)=2cos2x+9" ,then the value of "cos4x" is: "],[[" (a) "-(7)/(9)," (b) "-(3)/(5)],[" (c) "(1)/(3)," (d) "(2)/(9)]]

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