For a vector B = 1i-2j+3k find: (d) Vector magnitude |B| (e) Directional cosines 1 = cos(a) m = cos(3) n = cos(y) (f) Directional angles a, , in degrees Problem 3 (5 points) Find a unit vector in the direction of A=1i+2j - 2k (a) Vector magnitude |A| (b) A unit vector i A (a) 2 point (b) 3points Problem 4 (5 points) Consider vectors a, b, c. Are they linearly dependent? Show your work to justify. a == = [3 0 2 2] b:= [-6 42 24 54] C:= = [21-21 0 -15]