Question Number 123950 by hatakekakashi1729gmailcom last updated on 29/Nov/20
Commented by mindispower last updated on 29/Nov/20
$${done}\:{remember}\:{this} \\ $$
Commented by Dwaipayan Shikari last updated on 29/Nov/20
$$\frac{\pi^{\mathrm{2}} }{\mathrm{12}} \\ $$