Precalculus

Find the magnitude and direction angle θ of the vector.

u=4(cos102°i+sin102°j)

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asked by Brian
  1. u=4(cos102°i+sin102°j)
    = 4[cos102° , sin102°]

    the direction angle is clearly 102°
    magnitude = √(16(cos^2 102 + sin^2 102)
    = √(16(1))
    = 4

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    posted by Reiny

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