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Ok great, i thought that was why. Thanks once again for the help.

Thanks for the help guys it makes alot more sense now. One question though, when you are up to the stage where you get 5x = 4root(x^2+9) how does the 4 in the next line become 16? Is it because when you remove the sqaure root and multiply 5 by the indice of 2 you also multiply 4 by that same...

Ok, i have started but have gotton stuck again. So far I have derived T to get: 1/2(x^2+9)^-1/2 OVER 4 -(Minus)- 1 OVER 5 Is this correct? What is the next step? Thanks once more for your help.

Hi, I did this test just before the holidays started and I am only just looking at it now. I had no idea how to do it during the test and when I look back over the answer I was given I am still confused. I have done my best to list the whole question, i got full marks for part I) but did not get...