You are Here: Home >< Maths

# Differentiation Watch

u = V cos theta
v = V sin theta

V and theta are constants

The questions require me to differentiate u and v.

It basically asks whether du/dx + dy/dy = 0

However I don't have x or y values so they become 0+0 =0 right?
2. They are both zero provided theta is not a function of x or y. If this is not the case, then use the chain rule: du/dx = du/d0 x d0/dx
3. (Original post by Keoje)

u = V cos theta
v = V sin theta

V and theta are constants

The questions require me to differentiate u and v.

It basically asks whether du/dx + dy/dy = 0

However I don't have x or y values so they become 0+0 =0 right?
Are you sure that is the question

If it is then you have

u and v both as constants

So their rate of change is 0

However, the idea of and (I assume that was what you meant - are meaningless
4. I've taken the context out of it to simplify matters because it doesn't really matter too much. I guess part a was simpler than I thought.

I also made the mistake in thinking part b) was the same as other similar questions hence my confusion for this as it would of asked me to find out... but fortunately it doesn't so my worries about part a) are gone

du/dt = u * du/dx + v * du/dy

Thanks for the help

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: July 6, 2014
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Women equal with Men?

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.