Prove that if A and B are vectors, then the vectors lBl A + lAl B and lBl A - lAl B are orthogonal such that A=(a₁,a₂,a₃); B=(b₁,b₂,b₃); IAI=(a₁² ,a₂² ,a₃² );IBI=(b₁² ,b₂² ,b₃² )