Task $2$:

$\frac{{}^2}{2}=1+\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+\frac{1}{5^2}+$cdots$={\displaystyle \underset{1}{\overset{}{}}}\frac{1}{n^2}$

Calculate the value of $$ using the first $50$ terms of the above series. To calculate the square root, of

${}^2,$ use the function you developed in task $1.$