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a little Maths problem(paper4)

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Jerry_LA:
I am confused about the question on paper4 nov/oct 2006 question4
I have finished question C ,But i cannot write question D to F
Can any1 help me ?Just tell me how to do with following questions
Thanks~ :)

care:
The solution is attached.

I haven't done part f(ii), because I can only solve it by using derivatives. The graphical method of finding gradient is explained in the book.

Good luck!

Jerry_LA:
thanks a million :D

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