You are Here: Home >< Maths

# Core 3 Functions Question

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

The question asks you to solve |cosx| >/= sqrt3 / 2 for 0degrees</= x </= 360 degrees.

I did the following:
|cosx|>/= sqrt3 / 2 meaning x is 30 degrees
and |cosx|>/= - sqrt3 / 2 meaning x is 150 degrees.

They however get x is between 0 and 60, between 120 and 240 and between 300 and 360 (all of those are "or equal to" btw)

2. For , I would probably just find the points where and then consider the shape of the curve (do a quick sketch) to find the range of values that satisfy the inequality.
3. (Original post by B_9710)
For , I would probably just find the points where and then consider the shape of the curve (do a quick sketch) to find the range of values that satisfy the inequality.
I tried to do this but still couldn't get their answers I can't see what I'm doing wrong though
4. (Original post by Blake Jones)
Hi all!

The question asks you to solve |cosx| >/= sqrt3 / 2 for 0degrees</= x </= 360 degrees.

I did the following:
|cosx|>/= sqrt3 / 2 meaning x is 30 degrees
and |cosx|>/= - sqrt3 / 2 meaning x is 150 degrees.

They however get x is between 0 and 60, between 120 and 240 and between 300 and 360 (all of those are "or equal to" btw)

Have you been assuming (incorrectly) that

?
5. (Original post by notnek)
Have you been assuming (incorrectly) that

?
Nope but thanks for the suggestion

6. Basically we are looking for when the blue curve is above or at the same height as the green line.
7. (Original post by B_9710)

Basically we are looking for when the blue curve is above or at the same height as the green line.
Thanks for your help, I think I'll have to do a few more of this type of question to solidify it in my head

## 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: July 20, 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