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Homework Help: Calculator problem

  1. Jan 23, 2008 #1
    1. The problem statement, all variables and given/known data

    I typed in cos of -0.175 and I got .999999 and the physics book says it's 100. help!!!!

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 23, 2008 #2

    cos() of anything is never going to be 100. It is always in the range of [-1,1]. You would have to scale it to reach 100, that is 100*cos()
  4. Jan 24, 2008 #3
    i think this is enough for hint....

    cos[-x]=cos x...
  5. Jan 24, 2008 #4
    [tex] cos^{-1} (-0.175) = 100^0 [/tex]
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