Input: sum(1/k^2,k,1,oo)
Write: `sum(1/k^2,k,1,oo)`
Output: $$ \sum _{k=1} ^ {oo} \frac {1}{{k}^{2}} == \frac{1}{6}\ {\pi }^{2} $$ Result:$$\frac{1}{6}\ {\pi }^{2}$$