You are Here: Home >< Maths

# FP2 De-Moivre Watch

1. Could somebody help me out with the following please. Its part (c). Not even sure where to start, so any pointers would be appreciated. Thanks in advance.

2. (Original post by kingm)
Could somebody help me out with the following please. Its part (c). Not even sure where to start, so any pointers would be appreciated. Thanks in advance.

You need to use the previous part, bearing A, B and C in mind.

If you're still unsure, state the values of A, B and C
3. how do u do the whole question? how do u do part a?
4. (Original post by study beats)
how do u do the whole question? how do u do part a?
Seriously?

For part (a), use the fact that

and note that

5. (Original post by Indeterminate)
Seriously?

For part (a), use the fact that

and note that

whats 1/z

1/ cosx+sinx ?
6. (Original post by study beats)
whats 1/z

1/ cosx+sinx ?
Well, yes, but if you raise z to any power you multiply the argument by the same.
7. (Original post by Indeterminate)
You need to use the previous part, bearing A, B and C in mind.

If you're still unsure, state the values of A, B and C
Yeah, i'm still unsure. A, B and C are 1/8, 1/2 and 3/4 respectively. I get that you need to use the previous parts, but i'm not sure how and why.
8. (Original post by kingm)
Yeah, i'm still unsure. A, B and C are 1/8, 1/2 and 3/4 respectively. I get that you need to use the previous parts, but i'm not sure how and why.
Well,

9. (Original post by Indeterminate)
Well,

lool. That was rather easy in the end :-)

Cheers dude.
10. (Original post by Indeterminate)
Well,

Actually wait as sec. I'm sure that this is even more simple, but how is it that they then get k is equal to 1/12, 5/12, 7/12 and 11/12??
11. (Original post by kingm)
Actually wait as sec. I'm sure that this is even more simple, but how is it that they then get k is equal to 1/12, 5/12, 7/12 and 11/12??
Well, you may have made an error in working out A, B and C as they must have had

12. (Original post by Indeterminate)
Well,

It should be +3 here instead of +6. So thats where you may be getting mixed up.

(Original post by Indeterminate)
Well, you may have made an error in working out A, B and C as they must have had

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:
Updated: March 29, 2013
Today on TSR

### Medicine offers rolling in

Which unis have sent theirs?

### I refused to be served by tattooed cashier

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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.