Search results

Hi everyone (again - sorry...) From your past experience, is it necessary to learn/memorize how to prove the angle sum identities for trigonometry? I'm referring to the sin(x+y) and so on... It's easy to prove the double angle identities using the angle sum identities, so I can remember...

Hi everyone, After much frustration, I have resulted to this forum to answer my question! It is 15)c) in the picture below. Thanks in advance! EDIT: I should have added I can get the obvious results of 30 and -150, but the answers say that it is also 0 and +-180

Hi there, Is it possible to sit for example the Portuguese Continuers exam but not have to do the course in Year 12? Cheers, sheroom.