Question 1032684
Likely method:   You should multiply the two binomials and use the definition of cosecant. (Not exactly....)


Recognize the expression gives Difference of Squares.
{{{9*csc^2(x)-9}}}, already very simple.


Anything more?
{{{9(csc^2(x)-1)}}}, and an identify can be found for the quadratic expression;
{{{9*cot^2(x)}}}----------SIMPLIFIED.