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& : logical and
: -Racah polynomial : http://dlmf.nist.gov/18.28#E19
: -Pochhammer symbol : http://dlmf.nist.gov/5.18#i http://dlmf.nist.gov/17.2#SS1.p1
: cosine function : http://dlmf.nist.gov/4.14#E2
Equation in Section 14.2 of KLS.
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