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: dilogarithm : http://dlmf.nist.gov/25.12#E1
: ratio of a circle's circumference to its diameter : http://dlmf.nist.gov/5.19.E4
: principal branch of logarithm function : http://dlmf.nist.gov/4.2#E2
Equation (6), Section 25.12 of DLMF.
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