You are Here: Home >< Maths

# C3 Trigonometry help

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
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

Posted from TSR Mobile
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?

Posted from TSR Mobile
5. I would say so!

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: October 14, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams