a, \((x-2y)+(x+2y)(x-2y)=(x-2y)(1+x+2y)\)
b, \(=(x+y-2xy)(x+y+2xy)\)
c, \(=x^2(x^4-x^2+2x+2)=x^2[x^2(x^2+2x+1)-2x(x^2+2x+1)+2(x^2+2x+1)]=x^2(x^2+2x+1)(x^2-2x+2)=x^2(x+1)^2(x^2+2x+1)\)
d,\(=(x+1)^3-8y^3=(x+1-2y)(x^2+2x+1+2xy+2y+4y^2)\)
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