Question
Solve:
$ 25 x^4 y^4-1 $

Answer

$ 25 x^4 y^4-1 $
$ =\left(5 x^2 y^2\right)^2-1$
$ =\left(5 x^2 y^2-1\right)\left(5 x^2 y^2+1\right) $

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