ANSWER:

Seeking refuge in Allah (aauzubillah hi…) in the beginning is sufficient. You simply say bismillah before reciting fateha and other surahs in the following rak’ahs. 

If you get distracted by Satan in your salah, you simply seek refuge in Allah and drily spit towards your left. 

Is it mandatory to say ‘auzubillamishatan..rajeem-Bismillah..raheem’ in the beginning of every rakah OR Is it that i should only say bimillahi..rahem and carry on in the rakahs.i believe that we say ‘auzubillhi-minasita-rajem’ only once, in The beginning of the salah and if i get any distractions.what is correct please guide me.