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: $$\frac{1}{6}\ {\pi }^{2}$$
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