Hi QF203 classmate. Use the change of variable method taught in Lesson 9. Haha. Use u=x+y, and v=y.
f be continuous on [0; 1] and let R be the triangular region with vertices (0; 0); (1; 0) and (0; 1). Show that
I got stuck with the above question. Basically I got LHS:
How do I continue from here?