I need help simplifying this expression:

Question

(3x^3y^5 + 6x^2y^-2/6x^5y^-2)^2

(3x^3y^5 + 6x^2y^-2/6x^5y^-2)^2
the second term has a y^-2 in the numerator and denominator, so..

(3x^3y^5 + 6x^2 /6x^5 )^2

(3x^3y^5 + 1 /x^3 )^2

I am not certain much more can be done to simplify it.