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Input:
sum(1/k^2,k,1,x)
Write:
`sum(1/k^2,k,1,x)`
Compute:
$$\sum _{k=1} ^ {x} \frac{1}{k^2}$$
Output:
$$\sum _{k=1} ^ {x} \frac{1}{k^2}== harmonic(2,x)$$
Result: $$harmonic(2,x)$$
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