Evaluate a Double Integral Using Substitution Over a Rectangular Region - f(x,y)=xysin(x^2+y^2)

From a channel Lumen includes in full: Mathispower4u (James Sousa, a maths instructor) has thousands of short worked examples covering arithmetic through calculus, statistics and linear algebra, organised to match course topics.

A 7-minute video from Mathispower4u's catalogue; the title names its topic.

Video by Mathispower4u, played through YouTube's embedded player.