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...

Ah, OK - so that's the process? When writing my working, I should remember that if dividing through by tan x, then I need to remember to account for tan x = 0... Thanks!

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

Something like that.

That is just blatantly wrong.

Give me 10 minutes I can figure this one out and give an equation that you can use.

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.