• asin(z), acos(z), atan(z), asec(z), acsc(z), acot(z)—Return the value, in radians, of the arcsine, arccosine, arctangent, arcsecant, arccosecant, and arccotangent respectively. The returned value is the angle whose sin, cos, tan, etc, is z. It is taken from the principal branch of these functions. The result returned by acot is between 0 and π if z is real, or it is the principal value if z is complex.

• z is a dimensionless scalar or a vector of scalars.