You are Here: Home >< Maths

# C4 help

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. basically i did everything the question asked me accurately to but i have no idea how to interpret 'find the x coordinate of (the point)q' for last mark

surely sinq is the x coord of q and therefore one of my solutions for sinq is the x coord of the point Q?

2. (Original post by hi-zen-berg)
basically i did everything the question asked me accurately to but i have no idea how to interpret 'find the x coordinate of (the point)q' for last mark

surely sinq is the x coord of q and therefore one of my solutions for sinq is the x coord of the point Q?

No, sin(q) is the y-coordinate of Q.

x-coordinate is given by cos(2q) which via the double angle identity = 1-2sin^2(q)

## 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
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 15, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

## Make your revision easier

### 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

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.