Report - Teachingbd · 2017. 11. 24. · O + b2 - 2ab — a2 2ab + b2 = (a — = - '03 = (a - b) (a2 + + b2) = a2 + ab + b2 — (a — (a2 + ab -i b2) OFT, (a— (a2 + ab + b2) + (a — =

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