Question

solve on a square + b square + c square minus A square + b square + c square

Answer 1

a^2 + b^2 + c^2 - (a^2 + b^2 + c^2)
a^2 + b^2 + c^2 - a^2 - b^2 -c^2
= 0

Answer 2

a2 +b2 +c2-[a2+b2+c2] =a2+b2+c2-a2-b2-c2
=0