The powerful durga mantras for daily prayers are Sarva Mangala Mangalye and Durga Ashtakshara Mantra. Another very powerful mantra is associated with Durga Mantra is given below. The belief is that chanting this mantra is highly meritorious and will help a person achieve success and defeat enemies.
The mantra is:
The mantra has to be chanted on Tuesdays and Fridays.
You can find also Hindi Text of