public void TestArcCos()
{
for (Double x = -1.0; x <= 1.0; x += 0.01)
{
Double rad = x * DoublePrecision.Maths.Deg2Rad;
Fixed64 f = rad;
Fixed64 fs = Fixed64.ArcCos(f);
Double result = fs.ToDouble();
Double expected = Math.Acos(rad);
Assert.That(result,
Is.EqualTo(expected).Within(MathsTests.TestTolerance). // Check that result is within test tolerance for Fixed64
Or.EqualTo(expected).Within(MathsTests.PercentageTolerance * Math.Abs(result))); // or that result is within test percentage for Fixed64.
}
}