Question

and
31. Find a vector of magnitude 5 units which is coplanar with vectors 3î - j-k
î+j-2 k and is perpendicular to the vector 2 +2j+k.
32. If a, b and c are vectors such that a + b + c = 0, then show that the angle between
b vector and c vector is given by

cos=[a]^2 -[b}^2-[c]^2/2[b][c]​

Answer 1

Answer:

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