SIN
SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
inet_ntoa_r(SIN(dst)->sin_addr, addrbuf),
e = arprequest_internal(ifp, NULL, &SIN(dst)->sin_addr, NULL);
ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
lambda = *L + (1.919 - 0.005 * T) * SIN(M) + 0.020 * SIN(2 * M);/* 8 */
*DEC = ASIN(SIN(lambda) * SIN(epsilon)); /* 10 */
*ALT = ASIN(SIN(latitude) * SIN(*DEC) +
*AZ = ATAN(SIN(HA) /
(COS(HA) * SIN(latitude) - TAN(*DEC) * COS(latitude))); /* 14 */