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var cosh_data = [
[1.0000014305114746, 0.0016914556651292944],
[1.0000019073486328, 0.001953124689559275],
[1.000007152557373, 0.003782208044661295],
[1.000013828277588, 0.005258943946801101],
[1.0000171661376953, 0.005859366618129203],
[1.0000600814819336, 0.010961831992188852],
[1.0001168251037598, 0.015285472131830425],
[1.0001487731933594, 0.017249319093529877],
[1.0003981590270996, 0.028218171738655373],
[1.000638484954834, 0.03573281468231457],
[1.0010714530944824, 0.046287402472878776],
[1.0030217170715332, 0.07771996527168971],
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[6.9391326904296875, 2.625091127868242],
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[1887358976, 22.05159150215413],
[3738011648, 22.734966842639743],
[7486695424, 23.42954051928097],
[12668080128, 23.955498471391667],
[23918272512, 24.591055724582848],
[48862560256, 25.305424481799395],
[113763549184, 26.150535181949436],
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[321933279232, 27.19075733422632],
[715734122496, 27.989721778208146],
[1875817529344, 28.953212876533797]
];
var sloppy_tolerance = 8; // FIXME
for (var [x, y] of cosh_data)
assertNear(Math.acosh(x), y, sloppy_tolerance);
assertNear(Math.acosh(1e300), 691.4686750787737, sloppy_tolerance);
assertNear(Math.acosh(1.0000000001), 0.000014142136208675862, sloppy_tolerance);
for (var i = 0; i <= 100; i++) {
var x = (i - 50) / 5;
var y = Math.cosh(x);
var z = Math.acosh(y);
assertNear(z, Math.abs(x), sloppy_tolerance);
}
for (var i = 1; i < 20; i++)
assertNear(Math.acosh(Math.cosh(i)), i, sloppy_tolerance);
reportCompare(0, 0, "ok");