Cogent can be learnt easily by associating it with words co + agent and we can call it as cooperative agents and as cogent means a convincing arguments, we can say that cooperative agents are adept at making cogent arguments.
Meaning of cogent (Adjective):
1) An argument that is engaging in nature or convincing
2) To the point/relevant
Sentence example for cogent:
1) It was a cogent speech.
2) Convincing was achieved cogently. (Adverb)
3) His clauses were the most cogent clauses that anyone could ever hear.