# Formula:DLMF:25.8:E6

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## Constraint(s)

## Proof

We ask users to provide proof(s), reference(s) to proof(s), or further clarification on the proof(s) in this space.

## Symbols List

: sum : http://drmf.wmflabs.org/wiki/Definition:sum

: Riemann zeta function : http://dlmf.nist.gov/25.2#E1

: ratio of a circle's circumference to its diameter : http://dlmf.nist.gov/5.19.E4

: cotangent function : http://dlmf.nist.gov/4.14#E7

## Bibliography

Equation (6), Section 25.8 of **DLMF**.

## URL links

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