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(Solved): 7. Determine k, given two vectors and the angle between them. a. a=(1,2,3),b=(6k,1, ...

$7. Determine \( k \), given two vectors and the angle between them. a. \( \vec{a}=(-1,2,-3), \vec{b}=(-6 k,-1, k), \theta=90^$

7. Determine

k

, given two vectors and the angle between them. a.

a = (? 1, 2, ? 3), b = (? 6 k, ? 1, k), ? = 9 0^{?}

b.

a = (1, 1), b = (0, k), ? = 4 5^{?}

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For part (a) Angle between 2 vectors is 90°.Hence

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