An easy infinite series if you know about Digamma function

An easy infinite series if you know about Digamma function Digamma function playlist -    • Digamma function - (1) - Properties of Dig...   Integral | Nice integral | Hard integral | Gamma function | Digamma function | Zeta function | Eta function | Differentiation | Half derivative | Fractional calculus | Calculus | Beta function | Math | Integration | Feynman technique | Mellin transform | Laplace transform | Exponential | Equation | Complex analysis | Infinite series