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[tex]\frac{Sec^{2}\frac{y}{2}}{2} \eqiv \frac{2}{1+x^{2}}[/tex]

Well i know from the pythagorean identities that tan^{2}x + 1 = sec^{2}x

so

[tex]\frac{tan^{2}\frac{y}{2} + 1}{2} \eqiv \frac{2}{1+x^{2}}[/tex]

But now I am stuck!

If your interested the full qusetion is page 35, question 7 (ii) here:

http://www.edexcel.org.uk/VirtualContent/105484/GCE_Pure_Maths_C1_C4_Specimen_Paper_MkScheme.pdf

Can someone point me in the right direction

Cheerz