Factorization of x ^ 2n + 6x ^ n-y ^ 2m + 9

x^2n+6x^n-y^2m+9
=(x^2n+6x^n+9)-y^2m
=(x^n+3)^2-y^2m
=(x^n+3+y^m)(x^n+3-y^m)

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