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8 September, 08:59

Find the angle between the vectors. (first find an exact expression and then approximate to the nearest degree.) a = 5, - 1, 7, b = - 2, 4, 3

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  1. 8 September, 09:18
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    A. b=lallbl cos t

    a. b = (-2*5) + (-1*4) + (3*7)

    a. b=7

    lal=√ (25+1+49) = 5√3

    lbl=√ (4+16+9) = √29

    therefore:

    7=5√3*√29 cost

    cost=0.1501

    t=arccos 0.1501=81.37°
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