`A = 3i - j + 2k , b = - i + 3 j + 2k , c = 4i + 5j - 2k and d = i + 3j + 5k` then Compute the following
`(a xx b) .C - (a xx d).b`​

If bara = 2i + 3j - k , barb = - i + 2 j - 4k and barc = i + j + k . then (a xx b) · ( a xx c)

If bara = i + 5k, barb = 2i + 3k, barc = 4i - j + 2k and bard = i-j , then (barc - bara)·(barb xx bard) =

vec a = i + j + k, vec b = i-j + k, vec c = 2i + 3j-k then (vec aXvec b) Xvec c =

2i · (j xx k) - 3j · (i xx k) - 4k · (i xx j) =

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