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)
   0.50140 ulp for cosh(-6.723689052000176) = 415.94095557451544)
   0.50131 ulp for cosh(0.57554096819999701) = 1.1702463518938853)
   0.50124 ulp for cosh(2.7686593833135564) = 7.9999999999998614)
   0.50118 ulp for cosh(114.34369904200632) = 2.2793317427903286e+49)
   0.50113 ulp for cosh(-4.7782513819999286) = 59.452337356075645)
   0.50109 ulp for cosh(-5.8492832179998926) = 173.49423013412974)
   0.50105 ulp for cosh(0.71077356760008548) = 1.2634146608100618)
   0.50087 ulp for cosh(-7.3224416180001297) = 756.94823835618809)
   0.50085 ulp for cosh(0.16244840379999628) = 1.0132237843544702)
   0.50079 ulp for cosh(-0.16849723500000066) = 1.0142292770254728)
   0.50074 ulp for cosh(-51.039735290575713) = 7.3323873389926018e+21)
   0.50057 ulp for cosh(1.1815269319999799) = 1.7830785548232899)
   0.50057 ulp for cosh(-7.8929398279999736) = 1339.1532454741528)
   0.50056 ulp for cosh(-5.8492832179996377) = 173.49423013408551)
   0.50055 ulp for cosh(-79.897880104842102) = 2.5013729533883514e+34)
   0.50054 ulp for cosh(8.7853474180001161) = 3268.8720345971269)
   0.50050 ulp for cosh(-402.28930353068938) = 2.5762894580002043e+174)
   0.50049 ulp for cosh(0.57554096819992906) = 1.170246351893844)
   0.50045 ulp for cosh(-544.53953205072742) = 1.5469773396817485e+236)
   0.50042 ulp for cosh(-2.5078269240000051) = 6.1798322890704158)

<tr><td align=left><a href=cosh.res>cosh</a></td><td align=right>1331</td><td align=right>0.50140</td><td>-6.723689052000176</td><td>415.94095557451544</td></tr>