-8.6859247685756013e+00,
}

// The expected results below were computed by the high precision calculators
// at https://keisan.casio.com/.  More exact input values (array vf[], above)
// were obtained by printing them with "%.26f".  The answers were calculated
// to 26 digits (by using the "Digit number" drop-down control of each
// calculator).
var acos = []float64{
	1.0496193546107222142571536e+00,
	6.8584012813664425171660692e-01,