Partial Fractions Expansion of Cotangent/Proof 1/Historical Note
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Historical Note on Partial Fractions Expansion of Cotangent/Proof 1
The original demonstration of the partial fractions expansion of the cotangent function was presented by Leonhard Paul Euler.
It is non-rigorous, in the sense that it has not at this stage been established that it is in fact possible to perform that expansion of $\cot \pi x$ into such an expansion in the first place.
Sources
- 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {B}.20$: The Bernoulli Numbers and some Wonderful Discoveries of Euler