Answer
$(6^n-y^n)(6^n+y^n)$
Work Step by Step
The product of a binomial sum and a binomial difference is: $(A+B)(A-B)=A^2-B^2$.
Hence here: $36x^{2n}-y^{2n}=(6^n)^2-(y^n)^2=(6^n-y^n)(6^n+y^n)$
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