result of cosh is never more precise than double

3 results were exact to double the precision

20 largest ulp errors (stored in a double)
   0.78779 ulp for cosh(2.00000000000000044) = 3.76219569108363272)
   0.77663 ulp for cosh(-4.15908416799999969) = 32.0142462846785705)
   0.72231 ulp for cosh(2.76865938331357375) = 8)
   0.59519 ulp for cosh(-7.77861346000000076) = 1194.48027645171828)
   0.57360 ulp for cosh(1.96586753199999986) = 3.64056969522960694)
   0.56995 ulp for cosh(-4.1590841679989321) = 32.0142462846444076)
   0.56836 ulp for cosh(0.609336518999999188) = 1.19146110209247524)
   0.56235 ulp for cosh(-7.77861346000004072) = 1194.48027645176603)
   0.55665 ulp for cosh(-7.37027542199999619) = 794.035871116638646)
   0.55278 ulp for cosh(6.72688602200000574) = 417.272830341713473)
   0.55138 ulp for cosh(8.9597410960000019) = 3891.67109568961178)
   0.54939 ulp for cosh(-4.2655372800000011) = 35.6086050271967025)
   0.54817 ulp for cosh(0.479282989400001358) = 1.11707165009347387)
   0.54628 ulp for cosh(0.85702194600000059) = 1.39027885127289386)
   0.54611 ulp for cosh(-5.00819921400000467) = 74.8208578189131259)
   0.54289 ulp for cosh(9.52019874799999322) = 6816.16020727244268)
   0.53897 ulp for cosh(-0.500124640400000708) = 1.12769092349282829)
   0.53576 ulp for cosh(-8.59377740199999707) = 2698.98284181372628)
   0.53407 ulp for cosh(2.76865938331357109) = 7.99999999999997868)
   0.53407 ulp for cosh(1.99999999999999956) = 3.76219569108362961)

<tr><td align=left><a href=cosh.res>cosh</a></td><td align=right>1331</td><td align=right>0.78779</td><td>2.00000000000000044</td><td>3.76219569108363272</td></tr>