Trigonometry

For how many values of x such that 0<x<360 do we have cos(x) = 0.1? (x is in radians)

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asked by Katie
  1. You will have to use a calculator for this one.
    if cosx = .1
    then x = 84.26° correct to 2 decimals
    but cosine is positive in I or IV
    so x = 360-84.26 = 275.74°

    x = appr 84.26 or 275.74

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    posted by Reiny

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