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)
   346.50009 ulp for cosh(530.255722779804046) = 9.68510660094725285e+229)
   310.48748 ulp for cosh(530.255722779930124) = 9.68510660216837732e+229)
   304.94716 ulp for cosh(709.782712893384087) = 8.98846567431299659e+307)
   304.94716 ulp for cosh(-709.782712893384087) = 8.98846567431299659e+307)
   304.49970 ulp for cosh(449.845832681906245) = 1.16019995760350642e+195)
   297.49278 ulp for cosh(-627.136460574862781) = 1.15046717604641018e+272)
   277.50017 ulp for cosh(525.86578427200709) = 1.20109770016770337e+228)
   273.49980 ulp for cosh(-627.136460574800367) = 1.15046717597460844e+272)
   268.51982 ulp for cosh(449.845832681662102) = 1.16019995732017801e+195)
   253.49297 ulp for cosh(555.682155621193942) = 1.0682278164455824e+241)
   251.50090 ulp for cosh(374.117340018453035) = 1.49991399958978824e+162)
   248.49614 ulp for cosh(-530.685736686976725) = 1.48887100470951155e+230)
   247.49982 ulp for cosh(449.845832681667616) = 1.16019995732657786e+195)
   245.49921 ulp for cosh(-532.026098879880919) = 5.68812296559138324e+230)
   242.54071 ulp for cosh(-355.273103713203284) = 9.82015891037130262e+153)
   241.49957 ulp for cosh(-532.026098879393999) = 5.68812296282129857e+230)
   240.55114 ulp for cosh(-475.322357445586931) = 1.3453861984788632e+206)
   238.49982 ulp for cosh(530.255722779951157) = 9.68510660237215266e+229)
   231.50004 ulp for cosh(555.682155622539312) = 1.06822781788267229e+241)
   229.47276 ulp for cosh(-402.28930353068921) = 2.57628945799986596e+174)

<tr><td align=left><a href=cosh.res>cosh</a></td><td align=right>1331</td><td align=right>346.50009</td><td>530.255722779804046</td><td>9.68510660094725285e+229</td></tr>