Simplify:-(a+b-c)² + (a-b+c)² + 2(a+b-c) (a-b+c)
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the answer is (4 a^2 )
consider (a+b-c) = x , and (a-b+c) = y
then apply (x+y)^2
consider (a+b-c) = x , and (a-b+c) = y
then apply (x+y)^2
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