Sum of Reciprocals of Powers as Euler Product/Corollary 2/Examples/Zeta^2(4) over Zeta(8)

Example of Use of Sum of Reciprocals of Powers as Euler Product/Corollary 2

 * $\ds \prod_{\text {$p$ prime} } \paren {\frac {1 + p^{-4} } {1 - p^{-4} } } = \dfrac 7 6$

where the infinite product runs over the prime numbers.