The direction cosines of line joining `(1,-1,1) and (-1,1,1)` are (A) `2,-2,0` (B) `1,-1,0` (C) `1/sqrt(2)-1/sqrt(2),0` (D) none of these

Write the direction-cosines of the line joining the points (1,0,0) and (0,1,1).

Solution set of inequation ( cos^-1x)^2-(sin^-1x)^2gt0 is (A) [0, 1/sqrt(2)) (B) [-1, 1/sqrt(2)) (C) (-1,sqrt2) (D) none of these

The direction cosines of any normal to the xy-plane are (A) 1,0,0 (B) 0,1,0 (C) 1,1,0 (D) 0,01

If the direction cosines of a straighat line are k,k,k the (A) kgt0 (B) 0ltklt1 (C) k=1 (D) k=1/sqrt(3) or -1/sqrt(3)

The direction cosines of x-axis are (A) 0,0,1 (B) 1,0,0 (C) 0,1,0 (D) 0,1,1

If the direction cosines of a line are 1/c,1/c,1/c rthen (A) c.0 (B) 0ltclt1 (C) c=+-sqrt(3) (D) cgt2

Can the direction cosines of a line be 1/sqrt2 , 1/sqrt2, 1/sqrt2 ?

Find the direction cosines of the vector joining the points A(1,2,-3) and B(-1,-2,1) directed from A and B.

The length of perpendicular from the poit (1,-1,2) on the line (x+1)/2=(2-y)/3=(z+2)/4 is (A) 0 (B) sqrt(6) (C) sqrt(21) (D) none of these

Find the direction cosines of the vector joining the points A(1, 2, -3) and B(-1, -2, 1) directed from A to B .