straightforward, just use the formula for
I've never done this type question before, could you post how its done please. I know I have to use the formula but how is it done?
So what is x and y? Is it and ?
Or is it
Sorry for double post but I wanna get this.
you were asked to prove that
Krizalid gave you the sum identity for tangent ...
my initial post basically told you to substitute for and for ...
using the fact that ...
the original equation is proved ... you're done.
Wow, it seems so easy once you do it. Thanks.
Note that special angles exist, which are basically, sine, tangent and cosine of 30, 45, 60and 90. And you are required to recognise them..