# Math Help - [SOLVED] Integrability

1. ## [SOLVED] Integrability

Is $f(x,y) = (\sin(x) \sin(y)) / ({x^2 + y^2})$ integrable over $(-\pi/2,\pi/2) \times (-\pi/2,\pi/2)$?

2. Originally Posted by Amanda1990
Is $f(x,y) = (\sin(x) \sin(y)) / ({x^2 + y^2})$ integrable over $(-\pi/2,\pi/2) \times (-\pi/2,\pi/2)$?
Here's my answer: since $|\sin x\sin y|\leq |x||y|\leq \frac{1}{2}(x^2+y^2)$, we have $|f(x,y)|\leq \frac{1}{2}$. Thus $f$ is bounded and continuous, except perhaps at the point 0 (doesn't matter), so that it is integrable on any bounded subset of $\mathbb{R}^2$.