how to solve 1 - 2ab - (a2-b2) by using a combination of two identities
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1 - 2ab - (a^2-b^2)
1 - 2ab - (a+b)(a-b)
1 - 2ab - a^2 + ab +ab -b^2
1 - 2ab - a^2 +2ab -b^2
1 - 2ab -(a^2 -2ab +b^2)
1 - 2ab -(a-b)^2
1 - 2ab - (a^2-b^2)
1 - 2ab - (a+b)(a-b)
1 - 2ab - a^2 + ab +ab -b^2
1 - 2ab - a^2 +2ab -b^2
1 - 2ab -(a^2 -2ab +b^2)
1 - 2ab -(a-b)^2
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