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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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LIBRARY
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ACOSH.LI
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Text File
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1993-10-16
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257b
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10 lines
# acosh(x) is the inverse hyperbolic cosine function of x, the inverse
# of cosh(x).
# See also: cosh(x)
acosh(0) := pi/2*i
acosh(1) := 0
acosh(inf) := inf
acosh(-inf) := inf+pi*i
acosh(x_) := if( isnumber(x) and numeric==on, ln(x+sqrt(x^2-1)) )