You are Here: Home >< Maths

# Re arranging an equation Watch

1. Hi,

Any help re-arranging the equation below would be greatly appreciated

The following equation needs re-arranging to work out alpha (a)

Phase max = 90 - (2 * tan-1 (sqrt a))

In the actual problem my phase max = 14.14 and I know that the value of alpha (a) should work out to be 0.6072
I need to be able to derive the equation above in an upcoming exam so any help would be appreciated

Thanks

Dave
2. so . (I had to interpret that as being degrees, not radians; I assume that's what you wanted.)
3. (Original post by db52174)
Hi,

Any help re-arranging the equation below would be greatly appreciated

The following equation needs re-arranging to work out alpha (a)

Phase max = 90 - (2 * tan-1 (sqrt a))

In the actual problem my phase max = 14.14 and I know that the value of alpha (a) should work out to be 0.6072
I need to be able to derive the equation above in an upcoming exam so any help would be appreciated

Thanks

Dave
I make it 0.6073 not 0.6072
4. (Original post by joostan)
I make it 0.6073 not 0.6072
I put that down to a rounding error in deriving 14.14 - OP, it's usually better to work with fractions rather than decimals where possible, or at least many more significant figures than you need in the final answer.
5. (Original post by Smaug123)
I put that down to a rounding error in deriving 14.14 - OP, it's usually better to work with fractions rather than decimals where possible, or at least many more significant figures than you need in the final answer.
I also figured as much, though for phase - I swear its best to work in radians.
6. (Original post by joostan)
I also figured as much, though for phase - I swear its best to work in radians.
Yep, radians are much better in almost all cases.

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: April 9, 2013
Today on TSR

### Is this person a genius?

...with these A Level results?

### I think I'm transgender AMA

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.