You are Here: Home >< Maths

# C3 solomon paper B help please!!

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

Find, in terms of π, the solutions of the equation sin 5x + sin x = 0, for x in the interval 0 ≤ x < π.

I didn't know how to do it, but the mark scheme gave this as the identity you need to turn the equation into?

2 sin 3x cos 2x = 0

How do you form this equation what identity is it using?

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf
2. (Original post by eyeman567)
So confused

Find, in terms of π, the solutions of the equation sin 5x + sin x = 0, for x in the interval 0 ≤ x < π.

I didn't know how to do it, but the mark scheme gave this as the identity you need to turn the equation into?

2 sin 3x cos 2x = 0

How do you form this equation what identity is it using?

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf
You need to realise there is a link between Q3(a) and Q3(b).

From question 3(a), if you set and you get:

.
3. (Original post by Zacken)
You need to realise there is a link between Q3(a) and Q3(b).

From question 3(a), if you set and you get:

.
Thanks a lot haha, missed that completely.

could you help me with 4a?

y = x^5/2 ln x/4

when Y = 0 find the coordinate, only one mark but unsure what I need to do
4. (Original post by eyeman567)
Thanks a lot haha, missed that completely.

could you help me with 4a?

y = x^5/2 ln 4x

when Y = 0 find the coordinate, only one mark but unsure what I need to do
A curve crosses the x-axis when , so in this case: this means either or , but the first one gives but the question says so it's not a valid solution.

So you need to solve . What does that give you?

Hint:

## 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: April 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