If cot0= 4/3 find csc0

How to do this , and can some one explain

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b