Tangent functions.
gentype atan(gentype y_over_x)
gentype atan2(gentype y,
gentype x)
gentype atanh(gentype)
gentype atanpi(gentype x)
gentype atan2pi(gentype y,
gentype x)
atan
is the arc tangent function.
atan2
is the arc tangent of y
/ x
.
atanh
is the hyperbolic arc tangent function.
atanpi
computes atan
(x
) / π.
atan2pi
computes atan2
(y
, x
) / π.