Factorise :
a - b - a3 + b3
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Given,
= (a - b) - (a3 - b3)
= (a - b) - (a - b)(a2 + ab + b2)
= (a - b)(1 - a2 - ab - b2).
Hence, a - b - a3 + b3 = (a - b)(1 - a2 - ab - b2).
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