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**when s=2, then ζ (2) derivation is Basel problem.
**when s=2, then ζ (2) derivation is Basel problem.
**when s=3, then ζ (3) derivation is Apery's constant.
**when s=3, then ζ (3) derivation is Apery's constant.
**When s=4, then ζ (4) derivation is Planck's law
**When s=4, then ζ (4) derivation is Planck's law.
==Examples==
#=RIEMANNZETA(0)= -1/2
#=RIEMANNZETA(4) = π^4/90
#=RIEMANNZETA(-25)= -657931/12.