Factorize:
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[1-a^2][1-b^2]+4ab
=1-b^2-a^2+(ab)^2 +4ab
=1-[a^2+b^2-2ab]+(ab)^2 +2ab
=[ab+1]^2-[a-b]^2
=1-b^2-a^2+(ab)^2 +4ab
=1-[a^2+b^2-2ab]+(ab)^2 +2ab
=[ab+1]^2-[a-b]^2
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