please!!!!!help me one last time
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12. LHS = (x+y+z)^2
= (x+y+z)*(x+y+z)
= x(x+y+z) + y(x+y+z) + z(x+y+z)
= x^2+ xy +xz + xy + y^2+zy+ xz +zy +z^2
= x^2+y^2+z^2+2xy+2yz+2zx = RHS
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