`vec b,vecc` are unit vectors and `|vec a|=7`. `vec a xx (vec b xx vec c)+vec b xx (vec c xx vec a)=1/2 vec a` then the angle between `vec a and vec a` is

vec b,vec c are unit vectors and |vec a|=7vec a xx(vec b xxvec c)+vec b xx(vec c xxvec a)=(1)/(2)vec a then the angle between vec a and vec a is

The vectors vec a xx (vec b xxvec c), vec b xx (vec c xxvec a), vec c xx (vec a xxvec b) are

If vec a and vec b are unit vectors |vec a xx vec b| =1 then the angle between vec a and vec b is

If any vector vec a xx (vec b xx vec c) + vec b xx (vec c xx vec a) + vec c xx (vec a xx vec b) =

The vectors vec a xx (vec b xxvec c), vec b xx (vec c xxvec a) and vec c xx (vec a xxvec b) are

If vec a,vec b,vec c are any three vectors, prove that vec a xx (vec b xx vec c) +vec b xx(vec c xx vec a)+ vec c xx(vec a xx vec b) = vec 0

If vec a and vec b are unequal unit vectors such that ( vec a- vec b)xx[( vec b+ vec a)xx(2 vec a+ vec b)]= vec a+ vec b , then angle theta between vec aa n d vec b is 0 b. pi//2 c. pi//4 d. pi

If vec a and vec b are unequal unit vectors such that ( vec a- vec b)xx[( vec b+ vec a)xx(2 vec a+ vec b)]= vec a+ vec b , then angle theta between vec aa n d vec b is 0 b. pi//2 c. pi//4 d. pi

If vec(A) xx vec(B) = 0 and vec(B) xx vec(C ) = 0 , the angle between vec(A) and vec(C ) is :