| Pré. | Proc. |
tan
Circular tangent.SYNOPSIS:
double x, y, tan();
y = tan(x);
DESCRIPTION:
Returns the circular tangent of the radian argument x.
Range reduction is modulo pi/4.
A rational function:
x + x**3 P(x**2)/Q(x**2)
is employed in the basic interval [0, pi/4].
ACCURACY:
Relative error:
arithmetic domain # trials peak rms
DEC +-1.07e9 44000 4.1e-17 1.0e-17
IEEE +-1.07e9 30000 2.9e-16 8.1e-17
ERROR MESSAGES:
message condition value returned
total loss x > 1.073741824e9 0.0