1. In law, a concurring opinion is in certain legal systems a written opinion by one or more judges of a court which agrees with the decision made by the majority of the court, but states different (or additional) reasons as the basis for his or her decision.
2. When a group or a decision is unanimous, it means that everyone is in total agreement. ... The adjective unanimous comes from the similar Latin word unanimus, which means “of one mind.” So when people think unanimously, they all have the same idea in their heads. A vote is unanimous when all voters are in agreement.
Both of these are dictionary definitions. Read both and then compose a statement of what each of them are by themselves and then...start a new paragraph that states the difference of the unanimous opinion.
Hope this helps.