C-03-Q026mediumsingle_mcq2(ab+bc+ac)=?2(ab+bc+ac) = ?2(ab+bc+ac)=? (Corollary 8)a(a+b+c)2+(a2+b2+c2)(a+b+c)^2 + (a^2+b^2+c^2)(a+b+c)2+(a2+b2+c2)b(a+b+c)2−(a2+b2+c2)(a+b+c)^2 - (a^2+b^2+c^2)(a+b+c)2−(a2+b2+c2)c(a+b+c)2(a+b+c)^2(a+b+c)2da2+b2+c2a^2 + b^2 + c^2a2+b2+c2ব্যাখ্যাFrom the same expansion, moving a2+b2+c2a^2+b^2+c^2a2+b2+c2 to the other side gives 2(ab+bc+ac)=(a+b+c)2−(a2+b2+c2)2(ab+bc+ac)=(a+b+c)^2-(a^2+b^2+c^2)2(ab+bc+ac)=(a+b+c)2−(a2+b2+c2).