if x=b+c,y=c-a, z=a-b then find x^2+y^2+z^2-2xy-2xz+2yz
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bro at here we need put formulae i.e a^2 + b^2 + c^2 +2ab + 2bc + 2ca
(-x^2 + y^2 + z^2)
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