static int math_atan (lua_State *L) { lua_pushnumber(L, FROMRAD(atan(luaL_check_number(L, 1)))); return 1; }
static void math_atan2 (void) { lua_pushnumber(FROMRAD(atan2(luaL_check_number(1), luaL_check_number(2)))); }
static void math_atan() { lua_pushnumber(FROMRAD(atan(luaL_check_number(1)))); }
static void math_acos (void) { lua_pushnumber(FROMRAD(acos(luaL_check_number(1)))); }