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Please help me. I can't seem to get the answer of 165 degrees.

Find the angle ϴ between the vectors.
u=3i-3j, v=-2i+2√3j

  • math -

    The magnitude of u is sqrt 18.
    The magnitude of v is 4
    The dot product of u and v is
    u*v = -6 -6sqrt3
    = -6(1+sqrt3)
    The cosine of the angle between the vectors is
    (u*v)/|u||v|

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