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- # 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)) )