Question

evaluate direction cosines of a line joining two points p(2,4,7) and q(2,-5,3) ?? ​

Answer 1

Answer:

Solution: (x_1,y_1,z_1)=A and (x_2,y_2,z_2)=B dintance between A and B AB=`sqrt((x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1))` =`sqrt(9+4+64)` =`sqrt77` `(l,m,n)=((x_2-x_1)/(AB),(y_2-y_1)/(AB),(z_2-z_1)/(AB))` after putting the values =`(3/sqrt77,2/sqrt77,8/sqrt77)`