You are Here: Home >< Maths

# C2 Trigonometric Graph Question (OCR June 2015 past paper)

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016
1. Hi, I've been doing some C2 Past papers, and I've come across quite a tricky question on the most recent Ocr paper. I'm not really sure where to start in tackling this one.

If anyone could point me in the right direction it would be appreciated!

Edit - question is in the photo attached.
2. (Original post by sknmaster)
Hi, I've been doing some C2 Past papers, and I've come across quite a tricky question on the most recent Ocr paper. I'm not really sure where to start in tackling this one.

If anyone could point me in the right direction it would be appreciated!

Edit - question is in the photo attached.
It's just testing your knowledge of the trigonometric graphs; so, for example, if is a solution to the given equation, then - by the symmetry of the cosine graph so is .

It might help to mark these points on your graph as well as mark the roots of the cosine graph as and the minimum at .

For the next bit of the question ,try drawing the line , what do you think the solution is? Is it going to be or , etc...

Does that help?
3. (Original post by Zacken)
It's just testing your knowledge of the trigonometric graphs; so, for example, if is a solution to the given equation, then - by the symmetry of the cosine graph so is .

It might help to mark these points on your graph as well as mark the roots of the cosine graph as and the minimum at .

For the next bit of the question ,try drawing the line , what do you think the solution is? Is it going to be or , etc...

Does that help?
yes, took some time but i understand it now!

just to check, ordinarily the cos curve in this example would have a period of 2pi, but since the curve is 2tan1/3, there has been a stretch (affecting the x axis roots) as well as a vertical stretch of scale factor 2, meaning the period is now 6pi?
4. (Original post by sknmaster)
yes, took some time but i understand it now!

just to check, ordinarily the cos curve in this example would have a period of 2pi, but since the curve is 2tan1/3, there has been a stretch (affecting the x axis roots) as well as a vertical stretch of scale factor 2, meaning the period is now 6pi?
Nopes, the the curve has period .
5. Check out AZ TUTORING on You Tube they have got a lot of past paper exam questions on maths a level

Posted from TSR Mobile

## 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: May 1, 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

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