Release calc version 2.10.2t30

help/acosh

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+NAME
+    acosh - inverse hyperbolic cosine
+
+SYNOPSIS
+    acosh(x [,eps])
+
+TYPES
+    x		real, x >= 1
+    eps		nonzero real, defaults to epsilon()
+
+    return	nonnegative real
+
+DESCRIPTION
+    Returns the cosh of x to a multiple of eps with error less in
+    absolute value than .75 * eps.
+
+    acosh(x) = ln(x + sqrt(x^2 - 1)) is the nonnegative real number v
+    for which cosh(v) = x.
+
+EXAMPLE
+    > print acosh(2, 1e-5), acosh(2, 1e-10), acosh(2, 1e-15), acosh(2, 1e-20)
+    1.31696 1.3169578969 1.316957896924817 1.31695789692481670862
+
+LIMITS
+    unlike sin and cos, x must be real
+    eps > 0
+
+LIBRARY
+    NUMBER *qacosh(NUMBER *x, NUMBER *eps)
+
+SEE ALSO
+    asinh, atanh, asech, acsch, acoth, epsilon