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/*
Copyright (C) 2018 Fredrik Johansson
This file is part of Arb.
Arb is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "mag.h"
void
mag_cosh(mag_t res, const mag_t x)
{
if (mag_is_zero(x))
{
mag_one(res);
}
else if (mag_is_inf(x))
{
mag_inf(res);
}
else
{
mag_t t;
mag_init(t);
mag_exp(t, x);
mag_expinv(res, x);
mag_add(res, res, t);
mag_mul_2exp_si(res, res, -1);
mag_clear(t);
}
}
void
mag_cosh_lower(mag_t res, const mag_t x)
{
if (mag_is_zero(x))
{
mag_one(res);
}
else if (mag_is_inf(x))
{
mag_inf(res);
}
else
{
mag_t t;
mag_init(t);
mag_exp_lower(t, x);
mag_expinv_lower(res, x);
mag_add_lower(res, res, t);
mag_mul_2exp_si(res, res, -1);
mag_clear(t);
}
}
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