(a-b)³ = a³+3ab²- b³
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Answer:
hi friend,
(a+b)³=(a+b)(a+b)(a+b)
=(a²+2ab+b²)(a+b)
=a³+2a²b+ab²+a²b+2ab²+b³
=a³+b³+3a²b+3ab²
hence proved
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