ArcCos[x] + ArcSech[y] == -2 I Pi (Floor[(-Arg[(I x + Sqrt[1 - x^2])^I] - Arg[Sqrt[1/y - 1] Sqrt[1 + 1/y] + 1/y] + Pi)/(2 Pi)] + Floor[(Pi - Im[Log[Sqrt[1/y - 1] Sqrt[1 + 1/y] + 1/y]])/(2 Pi)] + Floor[(Pi - Re[Log[I x + Sqrt[1 - x^2]]])/(2 Pi)]) + Log[(I x + Sqrt[1 - x^2])^I (Sqrt[1/y - 1] Sqrt[1 + 1/y] + 1/y)] + Pi/2

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2007-05-02