Skip to main content
1 of 2
Gerald Edgar
  • 41.1k
  • 5
  • 125
  • 219

Yes the value $\pi/2$ can be obtained like this.

Let $$ f(x):=\frac {1}{x^2}-\frac{\cot(x)}{x} $$

We may compute $$ \int_0^{\pi/2} f(x)\;dx + \sum_{k=1}^\infty \int_0^{\pi/2}\big(f(\pi+x)+f(\pi-x)\big)\;dx=\frac{\pi}{2} $$ and this converges.

Gerald Edgar
  • 41.1k
  • 5
  • 125
  • 219