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  ·´ÓàÏÒArccos(X) = Atn(-X / Sqr(-X * X + 1)) + 2 * Atn(1)
  Secant£¨Õý¸î£© Sec(X) = 1 / Cos(X)
    Cosecant£¨Óà¸î£© Cosec(X) = 1 / Sin(X)
    Cotangent£¨ÓàÇУ© Cotan(X) = 1 / Tan(X)
    Inverse Sine£¨·´ÕýÏÒ£© Arcsin(X) = Atn(X / Sqr(-X * X + 1))
    Inverse Secant£¨·´Õý¸î£©:
Arcsec(X) = Atn(X / Sqr(X * X - 1)) + Sgn((X) - 1) * (2 * Atn(1))
    Inverse Cosecant£¨·´Óà¸î£©:
Arccosec(X) = Atn(X / Sqr(X * X - 1)) + (Sgn(X) - 1) * (2 * Atn(1))
    Inverse Cotangent£¨·´ÓàÇУ© Arccotan(X) = Atn(X) + 2 * Atn(1)
    Hyperbolic Sine£¨Ë«ÇúÕýÏÒ£© HSin(X) = (Exp(X) - Exp(-X)) / 2
    Hyperbolic Cosine£¨Ë«ÇúÓàÏÒ£© HCos(X) = (Exp(X) + Exp(-X)) / 2
    Hyperbolic Tangent£¨Ë«ÇúÕýÇУ© HTan(X) = (Exp(X) - Exp(-X)) / (Exp(X) + Exp(-X))
    Hyperbolic Secant£¨Ë«ÇúÕý¸î£© HSec(X) = 2 / (Exp(X) + Exp(-X))
    Hyperbolic Cosecant£¨Ë«ÇúÓà¸î£© HCosec(X) = 2 / (Exp(X) - Exp(-X))
    Hyperbolic Cotangent£¨Ë«ÇúÓàÇУ© HCotan(X) = (Exp(X) + Exp(-X)) / (Exp(X) - Exp(-X))
    Inverse Hyperbolic Sine£¨·´Ë«ÇúÕýÏÒ£© HArcsin(X) = Log(X + Sqr(X * X + 1))
    Inverse Hyperbolic Cosine£¨·´Ë«ÇúÓàÏÒ£© HArccos(X) = Log(X + Sqr(X * X - 1))
    Inverse Hyperbolic Tangent£¨·´Ë«ÇúÕýÇУ© HArctan(X) = Log((1 + X) / (1 - X)) / 2
    Inverse Hyperbolic Secant£¨·´Ë«ÇúÕý¸î£© HArcsec(X) = Log((Sqr(-X * X + 1) + 1) / X)
    Inverse Hyperbolic Cosecant HArccosec(X) = Log((Sgn(X) * Sqr(X * X + 1) + 1) / X)
    Inverse Hyperbolic Cotangent£¨·´Ë«ÇúÓàÇУ© HArccotan(X) = Log((X + 1) / (X - 1)) / 2
    ÒÔ N Ϊµ×µÄ¶ÔÊý LogN(X) = Log(X) / Log(N)

[ Last edited by arqiu on 2007-4-2 at 10:54 ]
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