Release calc version 2.10.2t30

help/acos

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+NAME
+    acos - inverse trigonometric cosine
+
+SYNOPSIS
+    acos(x [,eps])
+
+TYPES
+    x		real, -1 <= x <= 1
+    eps		nonzero real, defaults to epsilon()
+
+    return	real
+
+DESCRIPTION
+    Returns the acos of x to a multiple of eps with error less in
+    absolute value than .75 * eps.
+
+    v = acos(x) is the number in [0, pi] for which cos(v) = x.
+
+EXAMPLE
+    > print acos(.5, 1e-5), acos(.5, 1e-10), acos(.5, 1e-15), acos(.5, 1e-20)
+    1.0472 1.0471975512 1.047197551196598 1.04719755119659774615
+
+LIMITS
+    unlike sin and cos, x must be real
+    abs(x) <= 1
+    eps > 0
+
+LIBRARY
+    NUMBER *qacos(NUMBER *x, NUMBER *eps)
+
+SEE ALSO
+    asin, atan, asec, acsc, acot, epsilon