That's what I thought as well to start with. I think the double angle formulas jump out at you.

But I thought the OP might not have met them so I looked to see if I could bypass them. The tan2A formula comes from dividing by cos so I tried that instead and nearly fell off my chair.

Good to offer a choice so not redundant.

Bob

zetafunc.

2012-10-22 01:25:30

Bob bundy's way is the best way since it is only one step. Here is another neat way to do it but it takes a bit longer (it's how I did it though);

I still prefer the one-step method though, haha. So this post is a little redundant...

bob bundy

2012-10-21 19:00:48

hi woweycowey

Welcome to the forum!

I think you mean sin^2 (x) rather than sinx^2 ie.

Anyway start with the left hand side:

Divide top and bottom by

and it comes out straight away.

Bob

woweycowey

2012-10-21 13:43:54

If anyone could help with this that would be amazing, im just finding myself stuck.