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Math Help - Urgent help calculator problem

  1. #1
    mojo6592
    Guest

    Urgent help calculator problem

    Well heres an example of what is happening (i'm not too good at laying out my maths):

    Its cos
    Adj = 4
    Hyp = 10

    Cos x = 4 10
    X= cos(-1) 0.4
    The answer should be 66.4 but on my casio casio s-v.p.a.m it says 0.99997563
    what am i doing wrong?

    heres a link to the calculator if it helps
    http://www.sprinterservis.cz/darky/i...ator_casio.jpg
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  2. #2
    Super Member

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    Lexington, MA (USA)
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    Hello, mojo6592!

    Hard to understand what you're saying . . . but I'll take a guess.


    \cos x \:=\:0,4

    Then: . x \:=\:\cos^{-1}(0.4)
    This is correct!
    [You're pressing the wrong keys on your calculator.]

    You should get: . x \;=\;\cos^{-1}(0.4) \:=\: 66.42182152^o \;\approx\;66.4^o


    Press: . \boxed{2^{nd}}\;\boxed{\text{cos}}\;\boxed{0.4}\;\  boxed{=}

    That is, use the "key" that has: . \boxed{\cos^{-1}}


    What you found is: . \boxed{\cos}\:\boxed{0.4} \:=\:0.999975631

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  3. #3
    Bar0n janvdl's Avatar
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    Quote Originally Posted by mojo6592 View Post
    Well heres an example of what is happening (i'm not too good at laying out my maths):

    Its cos
    Adj = 4
    Hyp = 10

    Cos x = 4 10
    X= cos(-1) 0.4
    The answer should be 66.4 but on my casio casio s-v.p.a.m it says 0.99997563
    what am i doing wrong?

    heres a link to the calculator if it helps
    http://www.sprinterservis.cz/darky/i...ator_casio.jpg
    A friend of mine has a calc like that.

    \boxed{Shift} (The button at the top left) \ \boxed{cos} \ \boxed{0,4} \ \boxed{=}
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