Thanks. But my questions are (a) How can I derive (not just the expression) the n^{th} coefficient of the Taylor series for tanh(x) around x=0, and (b) the derivation of the radius of convergence (by e.g. root test).
Hi.
How can I derive the Taylor series expansion and the radius of convergence for hyperbolic tangent tanh(x) around the point x=0.
I can find the expression for the above in various sites, but the proof is'nt discussed. I guess the above question reduces to how can I get the expression...