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C3 Trigonometry help

I'm stuck on this part of the question and i'm not sure where i can go from here, would be great if someone could explain this?

https://postimg.org/image/tnxem6j1j/

Thanks

Posted from TSR Mobile

Reply 1

the bear

Original post by bhfn

I'm stuck on this part of the question and i'm not sure where i can go from here, would be great if someone could explain this?

https://postimg.org/image/tnxem6j1j/

Thanks

Posted from TSR Mobile

the top can be written as the difference of 2 squares...*

Reply 2

Pangol

I'm assuming that this is an identity that you are trying to prove. Your first step is good - you can now see that the numerator is the difference of two squares. Now - how do you factorise the difference of two squares?