The sqrt(n^2+n) + 1 is all on top of the denominator.
No need to flame. You could have said, "Alternatively here is a better method to approach the proof" which would be more helpful to Shadowdude.
There are a few additions of the syllabus I reckon they will test this year.
Domestic & International legal cases as highlighted above. For Option topic II Boolean Algebra and Unicode.
Re: HSC 2013 4U Marathon
Edit: Found a user called 'Jet' who made a wonderful guide on how to implement LaTeX onto the forum.
$Let$\;P(x)=x^4+a_{1}x^3+a_{2}x^2+a_{3}x+a_{4}\;$where for$\;a_{k}, k=1...4 \in \mathbb{R}. \;$Suppose$\; z_{1}=\cos \theta_{1}+i\sin \theta_{1} \;$and$\;z_{2}=\cos...