Question

What is the value of (projection of a→ on b→)/(projection of b→ on a→) for vectors a→ = 2î – 3ĵ – 6k̂ and b→ = 2î – 2ĵ + k̂ ?

Projection of vector 2î + 3ĵ on the vector 3î - 2ĵ is

Assertion (A): If a line makes angles α, β, γ with positive direction of the coordinate axes, then sin² α + sin² β + sin² γ = 2. Reason (R): The sum of squares of the direction cosines of a line is 1.

a→ and b→ are two non-zero vectors such that the projection of a→ on b→ is 0. The angle between a→ and b→ is :