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Factorise (a-b)^2 - (b-c)^2​

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Answer:
  1. a
  2.  {a}^{2}+{b}^{2}-2ab - ( {b}^{2}+{c}^{2}-2bc)
  3.  ={a}^{2}-{c}^{2}- 2b(a - c)
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