C-03-Q025mediumsingle_mcqa2+b2+c2=?a^2 + b^2 + c^2 = ?a2+b2+c2=? (Corollary 7)a(a+b+c)2(a+b+c)^2(a+b+c)2b(a+b+c)2−2(ab+bc+ac)(a+b+c)^2 - 2(ab+bc+ac)