29 Aug
2018
29 Aug
'18
2:27 a.m.
Bill, The Good Samaritan :D On 29 Aug 2018, at 03:29, Bill Gosper wrote: <snip>
All smirking aside, for general t, e.g., Pi == 2*t + 2*Sum[(Cosh[n*t]*(Cos[t]*Sech[t])^n*Sin[n*t])/n, {n, Infinity}] (t≠π/2) I don't recall anything like it. OtOH, at my age, I don't recall a lot of things. --rwg <snip> The values of x, verifying the identity seem to form a parable whose vertex
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