Ive realised i didnt fully simplify tan (pi/8) i left it as root((Root(2)-1)/(Root(2)+1))
Hopefully they wont penalise it, but ill probably lose another mark there =.=
I'm fairly sure you won't lose a mark for that. Good for me if people do, though.
It was pretty funny how I came across it, I was checking, and I typed tan pi/8 in the calculator. Then I typed the top line of that fraction (root2 - 1) in, and instead of divide, I accidentally hit equals, and I was like...'holy shit, that's the answer, must've done something wrong'. 30 seconds later, I realised that it could be rationalised.
But yeah, doubt you'd lose a mark for it.