Find the value of
Cosec73degree-(1/cot17degree)
csc73 - 1/cot17
= csc73 - tan17
= csc73 - cot73
= (1-cos73)/sin73
But I do not know the exact value. It is not related to any of the special angles we all know and love.
So I guess just get out your calculator and find an approximate value.
@BriBri,
read up on trigonometry.
I hope you already know some algebra ...