libjava/java/lang/s_tan.c

 * software is freely granted, provided that this notice
<<tan>> computes the tangent of the argument <[x]>.
Angles are specified in radians.
The tangent of <[x]> is returned.
 *      Let S,C and T denote the sin, cos and tan respectively on
 *	[-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
 *	TRIG(x) returns trig(x) nearly rounded
	int32_t n,ix;