[math-fun] Think you're good at Trig?
18 Jan
2019
18 Jan
'19
5:56 p.m.
I gave ries ArcTan[1/2]/ArcTan[1/3`22] and it quickly found. Cos[\[Pi]/(x + 1)] == 7/25 Quick, is that right?-) But interestingly, it can't do ArcTan[1/2]/ArcTan[1/4`22] There's probably a way to turn on arctrigs, but my manual is ancient. —rwg
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Bill Gosper