1.(x-y)^2(x+y)^2
2.(x-1/2)(x^2+1/4)(x+1/2)
3.(-12s^4t^6)/(1/2s^2t^3)^2
4.[(-5+x)(-x-5)]^2
5.(-3/2ab^4)^2*16a^5b/(-2a^2b^3)^3
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