1.Given planes P1:cy+bz=xP_1: cy+bz = xP1:cy+bz=x, P2:az+cx=yP_2: az+cx = yP2:az+cx=y, P3:bx+ay=zP_3: bx+ay = zP3:bx+ay=z. The planes P1P_1P1, P2P_2P2 and P3P_3P3 pass through one line, ifa.a2+b2+c2=ab+bc+caa^2+b^2+c^2 = ab+bc+caa2+b2+c2=ab+bc+cab.a2+b2+c2+2abc=1a^2+b^2+c^2+2abc = 1a2+b2+c2+2abc=1c.a2+b2+c2=1a^2+b^2+c^2 = 1a2+b2+c2=1d.a2+b2+c2+2ab+2bc+2ca+2abc=1a^2+b^2+c^2+2ab+2bc+2ca+2abc = 1a2+b2+c2+2ab+2bc+2ca+2abc=1Login to continueOnly logged in users canattempt or see the solution.
