निम्न में से कौन सी है। ५ a) (an-b) = 0+ 20b -Lb) (a-b) : - 2ab+b c) (a-b)² = až -6² (d) Catb)² = at zab-b² 1
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(a-b)²=a²-b²-2ab
(a+b+c)²=a²+b²+c²+2ab+2bc+2ca
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