Simplify [a+b+c]2-[a+b-c]2
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2a +2b+2c -2a-2b-2c
2a-2a+2b-2b+2c-2c
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2a-2a+2b-2b+2c-2c
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[a+b+c]2-[a+b-c]2
= 2a+2b+2c-2a-2b+2c (Expanding the bracketed terms)
=4c (Answer, after cancellation)
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