# Homework Help: Gradf and f

1. Apr 8, 2009

### -EquinoX-

1. The problem statement, all variables and given/known data

Let gradf = (2xy + sin(x)i + (x2 + 2)j.
Find f.

2. Relevant equations

3. The attempt at a solution

http://img7.imageshack.us/img7/6303/ansh.th.jpg [Broken]

Last edited by a moderator: May 4, 2017
2. Apr 8, 2009

### dx

If $$\nabla f = (2xy + \sin x)\bold{i} + (x^2 + 2)\bold{j}$$, your answer is correct.

3. Apr 8, 2009

### -EquinoX-

but then why webassign say it's wrong...

4. Apr 8, 2009

### dx

I checked again and It still looks right to me. Maybe you read the question wrong, or entered it wrong.

5. Apr 8, 2009

### -EquinoX-

pretty sure it's not wrong... hmmm

6. Apr 8, 2009

### -EquinoX-

okay.. I think the answer is right, it's just the way I format the answer in webassign and it doesn't accepts it.. also if I am asked:

Find the exact change in f between (0, 0) and (1, π/2).

do I just plug the numbers in?