The direction cosines of the line passing through P−2,4,3 and the origin are

The direction ratios of the line joining the points Ax1,y1,z1 and Bx1,y1,z1  isx2−x1,y2−y1,z2−z1The direction ratios of the line joining the points P−2,4,3,Q0,0,0 is−2,4,3Direction cosines are −24+16+9,44+16+9,34+16+9=−229,429,329