25(x+y)^2-441(x-y)^2
= (−16⋅x+26⋅y)⋅(26⋅x−16⋅y)
= 52x16y(13y+8x)
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25(x+y)^2-441(x-y)^2
= (−16⋅x+26⋅y)⋅(26⋅x−16⋅y)
= 52x16y(13y+8x)