C-03-Q041mediumsingle_mcqa2+b2+c2=?a^2 + b^2 + c^2 = ?a2+b2+c2=?a(a+b+c)2−2(ab+bc+ca)(a+b+c)^2 - 2(ab+bc+ca)(a+b+c)2−2(ab+bc+ca)b(a+b+c)2+2(ab+bc+ca)(a+b+c)^2 + 2(ab+bc+ca)(a+b+c)2+2(ab+bc+ca)c(a+b+c)2(a+b+c)^2(a+b+c)2d(a+b−c)2(a+b-c)^2(a+b−c)2