simplefy ( a+b+c)^² – (a-b-c)^²
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Answer:
a2+b2 +c2+2ab+2bc+2ca-(
a²+b²+c²-2ab+2bc-2ca)
=a2+b2+c2+2ab+2bc+2ca-a2-b2-c2+2ab-2bc+2ca
=therefore a2,b2,c2,2bc gets cancelled
=4ab+4ac
4a(b+c)
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