appropriate identity a square+2ab+b square-c square
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a^2 + 2ab + b^2 - c^2
= (a+b)^2 - c^2
= (a+b+c)(a+b-c)
= (a+b)^2 - c^2
= (a+b+c)(a+b-c)
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a^2+2ab+b^2-c^2
==(a^2+b^2)-c^2
==(a^2+b^2)-c^2
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