How do I go about this?

Question

I need details solution to study

find any given rectangle ∆ R=(xbase0,xbase0+w).(ybase0.ybase0+h) if we define function A A(R)=
∫ ∫R e^(2iπ(x+y)dxdy

????

Answer 1

what are the range of x,y. All real positive numbers?

Answer 2

Sir I don't know I saw the question like that I became so confuse

What do you have in mind sir ,with the range??