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33 * @(#)sincos.c 8.1 (Berkeley) 6/4/93
43 if(!finite(x)) /* sin(NaN) and sin(INF) must be NaN */
45 x=drem(x,PI2); /* reduce x into [-PI,PI] */
48 if(a >= PI3o4) /* ... in [3PI/4,PI] */
49 x = copysign((a = PI-a),x);
50 else { /* ... in [PI/4,3PI/4] */
51 a = PIo2-a; /* rtn. sign(x)*C(PI/2-|x|) */
55 a = (z >= thresh ? half-((z-half)-c) : one-(z-c));
60 if (a < small) { /* rtn. S(x) */
64 return x+x*sin__S(x*x);
73 if(!finite(x)) /* cos(NaN) and cos(INF) must be NaN */
75 x=drem(x,PI2); /* reduce x into [-PI,PI] */
78 if (a >= PI3o4) { /* ... in [3PI/4,PI] */
82 else { /* ... in [PI/4,3PI/4] */
84 return a+a*sin__S(a*a); /* rtn. S(PI/2-|x|) */
89 return s; /* rtn. s*C(a) */
94 a = (z >= thresh ? half-((z-half)-c) : one-(z-c));