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# C3 Trigonometry help Watch

1. 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

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2. (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...*
3. 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?
4. (Original post by 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?
so it would be
(cos^2 x + sin^2 x)(cos^2 x - sin^2 x) and then cancel out with the denominator and it would equal 1?

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5. I would say so!

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