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2.9.10  The ζ function : Zeta

Zeta takes as argument a real x.
Zeta returns for x>1 :

ζ(x)= 
+∞
n=1
 
1
nx
 

and for x<1 it’s meromorphic continuation.
Input :

Zeta(2)

Output :

pi^2/6

Input :

Zeta(4)

Output :

pi^4/90

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