GetXYBehindPlayer(playerid, &Float:x, &Float:y, Float:distance)
{
        new Float:a;
        GetPlayerPos(playerid, x, y, a);
        GetPlayerFacingAngle(playerid, a);
         // <===
        if (GetPlayerVehicleID(playerid))
        {
            GetVehicleZAngle(GetPlayerVehicleID(playerid), a);
        }
        a = a - 180; // <===
        x += (distance * floatsin(-a, degrees));
        y += (distance * floatcos(-a, degrees));
}