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  1. ahmed69

    Looking for Worked Solutions for Pure Math P3 2002-2011

    differentiate it by product rule after you differentiate you will get -atanx+sec ^2x change the sec^2x to 1+tan^2x you will then get a quadratic formula since they said it has only one root use b^2-4ac=0 to find a the sub in a to get x
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