Question

সরল করােঃ (a +b)(a -b) +(b +c)(b -c) +(c +a)(c-a)
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Answer 1

Answer:

(a+b)(a-b)+(b+c)(b-c)+(c+a)(c-a)

=a^2-b^2+b^2-c^2+c^2-a^2

=0