sincospi
extern void sincospi(double, double *, double *);
sincospi((double) x, &ds, &dc);
sincospi(u, &s, &c);
sincospi(t * u, &s, &c);
sincospi(t * u, &s, &c);
sincospi(t * u, &s, &c);
sincospi(w1, &t1, &t2);
sincospi(w2, &t3, &t4);
extern void sincospi(double, double *, double *);
sincospi(dt * du, &ds, &dc);
sincospi(dq, &ds, &dc);
extern void sincospi(double, double *, double *);