You are Here: Home >< Maths

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. tan of 15 degrees
2. (Original post by APersonYo)
tan of 15 degrees
.
3. What the person above said... I think 😁😁

Posted from TSR Mobile
4. (Original post by B_9710)
.
What then?
5. (Original post by APersonYo)
What then?
You know the value of tan30, let t be tan15 and solve a quadratic in t.
6. (Original post by APersonYo)
tan of 15 degrees
Personally I would go with saying tan(15) = tan(60-45) and then expand using the addition formula for tan.

And if you're not familiar with the double angle formulae yet then this may be a better approach. If you haven't seen the double angle formulae then B_9710's method just uses tan(30) = tan(15 + 15).

## 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 5, 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