Identify an expression equivalent to 1 / (cot (π/2 - x))

Question

Identify an expression equivalent to 1 / (cot (π/2 - x))  

a. sec x
b. csc x
c. tan x
d. cos x
e. none of these

 

Answer 1

1 / (cot (π/2 - x))=1/tan(x)=cot(x)

None of them.