# Homework Help: Double integrate from cartesian to polar and then evaluated

1. Apr 18, 2009

### jimbo71

1. The problem statement, all variables and given/known data
convert double integral from line one to polar integral and then evaluate
see problem 12 attachment

2. Relevant equations
y=rsinx
x=rcosx
r^2=x^2+y^2

3. The attempt at a solution
see problem 12 attachment
I calculate a area of zero. are my limits wrong and if so which ones, or did i make a mistake in the aritmatic, or something else?

#### Attached Files:

• ###### problem 12.jpg
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2. Apr 18, 2009

### Tom Mattson

Staff Emeritus
You start to go wrong at the end of the 5th line. $e^{-1}$ does not equal $e$.