find the square of a-b+c
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(a-b+c)^2
= (a-b+c)(a-b+c)
=a(a-b+c)-b(a-b+c)+c(a-b+c)
=a^2-ab+ac-ba+b^2-bc+ca-cb+c^2
=a^2+b^2+c^2
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