For the discussion of math. Duh.
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While working on a problem I figured that the sum n=1 to infinity (1/(2^(2n-1)*(4n-2)))*(-1)^(n-1) = (arctan(1/2))/2 , and checked it with wolframalpha, but forgot to put the '' *(-1)^(n-1) '' in the input. However I did not realize this, because the answer wolframalpha gave me was (arctanh(1/2))/2 , appearing to be the same thing. And the difference between the two values is a mere .04.... I was confused for a while, and then finally realized my mistake. Has anyone else ever had anything similar ever happen, coincidences and such?
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