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)
   0.58622 ulp for cosh(709.782711803935854) = 8.98845588184967683e+307)
   0.58622 ulp for cosh(-709.782711803935854) = 8.98845588184967683e+307)
   0.55114 ulp for cosh(-475.322357445586931) = 1.34538619847890597e+206)
   0.54949 ulp for cosh(-526.447518918487049) = 2.14893105608059935e+228)
   0.54733 ulp for cosh(-105.987842953823957) = 5.35679896431098736e+45)
   0.54694 ulp for cosh(608.631543841552229) = 1.05752588646374975e+264)
   0.54519 ulp for cosh(583.056460069679474) = 8.26367541961568611e+252)
   0.53553 ulp for cosh(-320.511549999005297) = 7.85900482057854814e+138)
   0.53006 ulp for cosh(-509.603387549860599) = 1.03970271114061174e+221)
   0.52834 ulp for cosh(567.241780796960597) = 1.11929692187587447e+246)
   0.52620 ulp for cosh(260.499000154894929) = 6.7959208623468411e+112)
   0.52612 ulp for cosh(530.255722779931489) = 9.68510660218192406e+229)
   0.52320 ulp for cosh(182.502458867650034) = 9.0945418198517754e+78)
   0.52014 ulp for cosh(-370.899775879372953) = 6.00753082538588292e+160)
   0.51982 ulp for cosh(449.845832681662102) = 1.16019995732021277e+195)
   0.51900 ulp for cosh(275.631800544468206) = 2.53711421069887863e+119)
   0.51872 ulp for cosh(555.682155622590017) = 1.06822781793687042e+241)
   0.51719 ulp for cosh(-627.136460574854254) = 1.15046717603664545e+272)
   0.51717 ulp for cosh(-265.728599971742597) = 1.26892120786970216e+115)
   0.51642 ulp for cosh(315.34760224396922) = 4.49462579916481956e+136)

<tr><td align=left><a href=cosh.res>cosh</a></td><td align=right>1331</td><td align=right>0.58622</td><td>709.782711803935854</td><td>8.98845588184967683e+307</td></tr>