hsc auxiliary angoes (1 Viewer)

[maxxxxx]

for context I go to a non-selective public school and my teachers are very relaxed in terms of auxiliary angle questions specifically in extension one exams. Being taught out of the maths and focus textbook we were taught the very simple way of taking R as equal to the square root of A squared + B squared.

Now in trial revision I’m doing trial questions about auxiliary angles and it’s often pointed out in the marking guidelines that it is not a permissible way to solve auxiliary angle and we should go through the complete process of equating coefficient and using that Pythagorean identity and what not.

In the actual HSC exam, not in trials - especially not in selective school trials because that does not apply to me - would I be penalised for using the simple formula for R rather than going through the whole process?

 

[liamkk112]

for context I go to a non-selective public school and my teachers are very relaxed in terms of auxiliary angle questions specifically in extension one exams. Being taught out of the maths and focus textbook we were taught the very simple way of taking R as equal to the square root of A squared + B squared.

Now in trial revision I’m doing trial questions about auxiliary angles and it’s often pointed out in the marking guidelines that it is not a permissible way to solve auxiliary angle and we should go through the complete process of equating coefficient and using that Pythagorean identity and what not.

In the actual HSC exam, not in trials - especially not in selective school trials because that does not apply to me - would I be penalised for using the simple formula for R rather than going through the whole process?

in the nesa marking guidelines they have included the working out to find R through simultaneous equations. this doesn’t necessarily mean that you would be penalised for using the formula straight away, but it’s a good idea to show the working out and id encourage it (additionally, if you get something wrong you can get partial marks for having working out, and it overall makes you less prone to making errors)