dw i got more than just sinx + cosx=1 wrong
afaik i got 13biii, 13biv, 14cii wrong and maybe made some algebra errors in other questions (dunno)
anyways as how to I got it wrong, i thought cosπ=1
from looking at the mx2 mastering math books, i reckon the advanced ones are gonna be way too hard for advanced (unless it's chill unlike the mx2 challenge questions)
rank is rank of cumulative mark so ur assessments marks and their weightings
https://educationstandards.nsw.edu.au/wps/portal/nesa/11-12/hsc/about-HSC/moderation