You are Here: Home >< Maths

# C3 Solomon H

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Can anyone help? Question 4b).

In the mark scheme they got that at (pi/2, -1), -1 = a+b.

And at (3pi/2, -5), -5 = a-b.

But I just don't understand why they got that... I know it's to do with -1 shifting the graph downwards, and b stretching the graph by a scale factor of b...

Thanks
2. (Original post by Barryl)
Can anyone help? Question 4b).

In the mark scheme they got that at (pi/2, -1), -1 = a+b.

And at (3pi/2, -5), -5 = a-b.

But I just don't understand why they got that... I know it's to do with -1 shifting the graph downwards, and b stretching the graph by a scale factor of b...

Thanks
Well, what is f:x actually? It's not to do with transformations or anything (it could be, but I could see that being more complicated than the alternative method).

Think about all of the information that you are given.
3. (Original post by SeanFM)
Well, what is f:x actually? It's not to do with transformations or anything (it could be, but I could see that being more complicated than the alternative method).

Think about all of the information that you are given.
Wow, can't believe I missed it. When x = pi/2, csc x = 1. So at (pi/2, -1), a+b(1) = -1

And at (3pi/2, -5), -5 = a + b(-1) = a-b.

Just had to think a little bit more...

Thanks for the push!
4. (Original post by Barryl)
Wow, can't believe I missed it. When x = pi/2, csc x = 1. So at (pi/2, -1), a+b(1) = -1

And at (3pi/2, -5), -5 = a + b(-1) = a-b.

Just had to think a little bit more...

Thanks for the push!
No worries. In any maths exam, or indeed any exam. think about the information you're given and what use it could possibly be.

## 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: June 18, 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