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• Identical expressions

• gamma(x + one)*polygamma(zero = x + one , zero)
• gamma(x plus 1) multiply by polygamma(0 equally x plus 1, 0)
• gamma(x plus one) multiply by polygamma(zero equally x plus one , zero)
• gamma(x + 1)polygamma(0 = x + 1, 0)
• gammax + 1polygamma0 = x + 1, 0

• Similar expressions

• gamma(x - 1)*polygamma(0 = x + 1, 0)
• gamma(x + 1)*polygamma(0 = x - 1, 0)