zeta(2)= Pi^2/6 = (-496 Zeta[5] + Zeta[5, 1/4])/(10 (-28 Zeta[3] + Zeta[3, 1/4])) = (25 (8128 Zeta[7] - Zeta[7, 1/4]))/(244 (496 Zeta[5] - Zeta[5, 1/4]))

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