- #1

FOIWATER

Gold Member

- 434

- 12

double integral (x+y) dA , A is the area bounded by the triangle with vertices (0,0) (0,1) (1,0)

equal 1/3

While this one, (x-y) dA , A is the area bounded by the same vertices

equal 0?

(not looking for the math, already worked them out, just looking for some logic behind why the second one would be zero).

Thanks!