NAME
    csch - hyperbolic cosecant

SYNOPSIS
    csch(x [,eps])

TYPES
    x		nonzero real
    eps		nonzero real, defaults to epsilon()

    return	real

DESCRIPTION
    Calculate the csch of x to a multiple of epsilon, with error less in
    absolute value than .75 * eps.

    csch(x) = 2/(exp(x) - exp(-x))

EXAMPLE
    > print csch(1, 1e-5), csch(1, 1e-10), csch(1, 1e-15), csch(1, 1e-20)
    .85092 .8509181282 .850918128239322 .85091812823932154513

LIMITS
    none

LIBRARY
    NUMBER *qcsch(NUMBER *x, NUMBER *eps)

SEE ALSO
    sinh, cosh, tanh, sech, coth, epsilon