(a+b)^3-(a-b)^3
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Yogita Ingle 4 years, 2 months ago
(a+b)3 - (a-b)3
= [ a3 + b3 +3a2b +3ab2] -[ a3 - b3 -3a2b +3ab2]
= a3 + b3 +3a2b +3ab2 - a3 + b3 +3a2b - 3ab2
= b3 +3a2b + b3 +3a2b
= 2b3 +6a2b
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