[" If "vec A=2i+j-k,vec B=i+2j+3k" and "quad vec c],[=6i-2j-6k," then the angle between "(],[vec A+vec B)" and "vec c" will be "]

If vec(A) = 2 I + j - k , vec(B) = I + 2 j + 3 k , and vec(C ) = 6 i - 2 j - 6 k ,then the angle between (vec(A) + vec(B)) and vec(C ) will be

If vec a = i +j and vec b = j-k then the angle between vec a + vec b and vec a - vec b is

vec(a)= -i+j+2k , vec(b)=2i-j-k and vec(c)=-2i+j+3k ,then the angle between 2vec(a)-vec(c) and vec(a)+vec(b) is

If vec a = 2i+3j-4k, vec b = i + j +k and vec c = 4i+2j+3k , then |vec a xx (vec b xx vec c)| =

If vec a = i+j-2k, vec b = -i+2j+k and vec c = i-2j+2k then a unit vector parallel to vec a + vec b + vec c is

If vec a = 3i -2j + 2k, vec b = 6i-4j-2k and vec c = 3i-2j -4k , then vec a . (vec b xx vec c) is

If vec a = i+j+k, vec a. vec b = 1 and vec a xx vec b = j-k then vec b =