C-03-Q090mediumsingle_mcq(x+y)(x2−xy+y2)+(y+z)(y2−yz+z2)+(z+x)(z2−zx+x2)=?(x+y)(x^2 - xy + y^2) + (y+z)(y^2 - yz + z^2) + (z+x)(z^2 - zx + x^2) = ?(x+y)(x2−xy+y2)+(y+z)(ya2(x3+y3+z3)2(x^3 + y^3 + z^3)2(x3+y3+z3)