I can't pick an answer when you don't list the answers (not that I would have just given you the answer straight up anyway). But I will tell you that in order to find csc, you need the reciprocal of sin. But in order to find sin from cos, you need to square cos, subtract from 1, and then take the square root. Of course you need to deal with the fact that you have a positive and a negative result for sin and then for csc as well.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
