Hi There,

I hope its ok to post here as i didn't see a group for Integration....

I have this problem in my studyguide which provides a solution but no working. I cannot figure out the steps to get it. Any help will be very much appreciated.

Here goes

Sketch the region R and calculate the doubleIntegral for

f(x,y)=sin(x+y)

R={(x,y) | x >=0, y>=0 and x+y =< π} (this last term is pi)

The answer to this is π ie pi ie 180 degrees.

I know that with the double integral the first integral must have the constants, but seeing as we have a non-constant for x and y I don't know how to tackle it

Many thanks

PS I tried using the math tag but it removed and changed some of the characters