Yeah, your first task is usually the lightest in weighting, and you still got more internals to come. The mark you get is actually irrelevant apart from the fact that it gives your ranks for school. If you ranked well in your first assessment your on track to 99. Don't sweat the actual marks cause the don't contribute to your atar. This is because multiple schools have varying difficulties and it would be unfair to just use the mark gotten by students, since teachers could write easier exams to bolster potential marks.
you should probably know that sin and tan are odd, whereas cos is even, and that sin and cos are 2pi periodic whereas tan is pi periodic. for adding angles in the arguments like sin(x +pi/2) = cosx, just memorise the sin, cos and tan angle sum identities and then u can derive it with whichever angle.
yes easily, an 80 to 90 in mx1 is actually a pretty good mark
Is third alright for an early 100s ranked school?
depends what you're aiming for but its still pretty good
~97-98?
pretty good then, it just depends on ur cohort really, ranking isn't necessarily reflective of that. just try to internally rank as high as you can for more security
could you elaborate on "angle sum identites". Did you mean compound angle formulas?
By angle sum identities, I think @liamkk112 is referring to results like:
