pre-Cal(Please help)

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Use the law of cosines to find the angle Q between the given vectors.

v = 3i + j w = 2i - j

  • pre-Cal(Please help) -

    v•w = |v| |w|cos Ø

    v•w = 6 - 1 = 5
    5 = √10√5cosØ
    cosØ = 5/√50
    Ø = 45°

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