ArcSec[z] == Pi/2 + ((z Sqrt[-2 + z^2])/(2 Sqrt[z^2 (2 - z^2)])) ArcCosh[(2 Sqrt[z^2 - 1])/z^2] - (Pi/4) Sqrt[(z^2 - 2)/z^2] Sqrt[z^2/(-2 + z^2)] (Sqrt[z^2]/z + Sqrt[(z - Sqrt[2])/z] Sqrt[z/(-Sqrt[2] + z)] - Sqrt[z/(Sqrt[2] + z)] Sqrt[(Sqrt[2] + z)/z])

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2003-08-21