Hi,
The VectorCalculus package offers a convenient way to compute multivariate integral over a non-square geometry. See help("VectorCalculus/int"). Here is an example taken from this help page:
with(VectorCalculus):
int( x*y, [x,y] = Triangle( <0,0>, <1,0>, <0,1> ) );
The question is: is there a way to draw the area “Triangle( <0,0>, <1,0>, <0,1> )” in order to quickly check that it matches the expected region of integration that one needs?