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.hd dcsh$m "calculate double precision hyperbolic cosine" 04/27/83
longreal function dcsh$m (x)
longreal x
.sp
Library: vswtmath (Subsystem mathematical library)
.fs
This routine calculates the hyperbolic cosine of its argument,
defined as cosh(x) = [exp(x) + exp(-x)]/2.  The absolute value of
the argument must be less than 22623.630826296.
The condition SWT_MATH_ERROR$ is signalled if there is an argument error.
An on-unit can be established to deal with this error; the SWT Math
Library contains a default handler named 'err$m' which the user may
utilize.
If an error is signalled, the default function value is zero.
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Adapted from the algorithm given in the book
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Software Manual for the Elementary Functions
by William Waite and William Cody, Jr.  (Prentice-Hall, 1980).
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dexp$m, Primos signl$
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cosh$m (2), dexp$m (2), dsnh$m (2), err$m (2),
.br
.ul
SWT Math Library User's Guide
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