If `P-=(1,5,4) and Q-=(4,1,-2)` find the direction ratios of `vec(PQ)`

If P = (1, 5, 4) and Q = (4, 1, -2) then find the d.r. of PQ.

If P(-2,4,-5) and Q(1,2,3) are two points. Find the direction cosines of bar(PQ)

Find the length of the projection of the line segment joining the points P(3,-1,2) and Q(2,4-1) on the line with direction ratios

If P,Q,R,S are points (1,2,5), (-2,1,3) , (4,4,2) and (2,1,-4) respectively, find the projection of PQ on RS.

If vec(OP)=2hati+3hatj-hatk and vec(OQ)=5hati+4hatj-3hatk . Find vec(PQ) and the direction cosines of vec(PQ) .

If P=(2,4,7) and Q=(-4,-1,5) , then find bar(PQ) and |bar(PQ)|