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Looking for Worked Solutions for Pure Math P3 2002-2011

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i have a doubt in recent paper it is feb march 2017 paper 32 question 5
can anyone please help me out in this
thank you sooo much in advance
 

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i have a doubt in recent paper it is feb march 2017 paper 32 question 5
can anyone please help me out in this
thank you sooo much in advance
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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