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Homework Help: Trig, What would this reduce to?

  1. Sep 23, 2012 #1

    TheRedDevil18

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    1. The problem statement, all variables and given/known data

    cos(-225)

    3. The attempt at a solution

    Would it become, -cos45 ?
    Just want to make sure.
     
    TheRedDevil18, Sep 23, 2012
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  3. Sep 23, 2012 #2

    HallsofIvy

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    Science Advisor

    Are we to assume that this is 225 degrees?

    If so then 225= 360- 35, NOT 45.
     
    HallsofIvy, Sep 23, 2012
  4. Sep 23, 2012 #3

    Mentallic

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    Homework Helper

    TheRedDevil18, you're correct.

    That's not right, it's 225 = 360 - 135.
     
    Mentallic, Sep 23, 2012
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