Can someone please explain to me how to solve this question:

Determine an exact value for each expression:

a) [cot(pi/4)]/[(cos(pi/3))(csc(pi/2))]

b) [cos(pi/6)][csc(pi/3)]+sin(pi/4)

even if you explain one of them, that would be appreciated! I don't understand this question at all, so please be detailed.

thank you so much