Hint: What are the identities for tan(x/2) in terms of sine and cosine?
The best way to start is to write all the identities of sin and cosin, simplify, and then consider what identities you might need.
so there's no way to solve it as is?
The identity is true when the problem is
cscx = cot(x/2)/(1+cosx)
The identity is cscx = ( cot (x/2))/(1+cosx) = ( cos (x/2)/ sin ( x/2))/ [2 cos^2 ( x/2) ] [ Because cos 2a = 2cos^2A-1]
Which on simplification gives cscx