x Turn on thread page Beta
 You are Here: Home >< Maths

# C4 Harmonic Form Help Please. :) watch

1. Hello there,

Express 4sinx + 3cosx in the form Rsin(x+alpha), where R and alpha are constants with R>0 and 0<alpha<90.

I got alpha = 36.87?? (2DP)

I got R = +/- 5??

therefore 5sin(x+36.87)??

Hence find the greatest value of:-

1/(4sinx + 3cosx + 7).

I got:

-5 </= 5sin(x+36.87) </= +5

therefore the greatest value = 1/2??

Any help would be appreciated! Thanks!

2. Unlucky with Bristol. They rejected me as well
3. (Original post by chaz1992)

Unlucky with Bristol. They rejected me as well
Thanks for your time. I'm sorry bout Bristol too.

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 20, 2011
Today on TSR

### Been caught plagiarising...

...for the 2nd time this year

### Mum says she'll curse me if I don't go to uni

Discussions on TSR

• Latest
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

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