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5.9.18  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 its meromorphic continuation.
Input:

Zeta(2)

Output:

pi^2/6

Input:

Zeta(4)

Output:

pi^4/90

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