x Turn on thread page Beta
 You are Here: Home >< Maths

# C2 maths help watch

1. Given that x is an acute angle and sin x =12/13, use the identity cos^2 x + sin^2 x= 1 to show that 13cos x =5.
2. (Original post by man111111)
Given that x is an acute angle and sin x =12/13, use the identity cos^2 x + sin^2 x= 1 to show that 13cos x =5.
Cool, let's work through this.

Do you know what an acute angle is? An angle between 0 and 90 degrees.

So,

Can you finish?
3. (Original post by Apachai Hopachai)
Cool, let's work through this.

Do you know what an acute angle is? An angle between 0 and 90 degrees.

So,

Can you finish?

Hi, thanks for replying. I don't know how to finish it?
Is (cos x)^2 the same as cos^2 x
4. (Original post by man111111)
Hi, thanks for replying. I don't know how to finish it?
Is (cos x)^2 the same as cos^2 x
Yes it is. NOW do you know how to finish?
5. (Original post by RDKGames)
Yes it is. NOW do you know how to finish?
Hi thanks for replying. I don't know how to finish it.
6. (Original post by man111111)
Hi thanks for replying. I don't know how to finish it.
Okay.....

If you say then your equation becomes and you want to solve for Y.

Is this clearer...?
7. (Original post by man111111)
Hi thanks for replying. I don't know how to finish it.
This is not food, you can't just throw it in the bin if you can't finish it.

FINISH IT
8. (Original post by RDKGames)
Okay.....

If you say then your equation becomes and you want to solve for Y.

Is this clearer...?
Thank you for helping me.

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:
Updated: May 19, 2017
Today on TSR

### Loughborough better than Cambridge

Loughborough at number one

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams