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arch tanget

Discussion in 'Homework Help' started by shermaine, Apr 29, 2009.

  1. shermaine

    shermaine New Member

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    hi,

    may i know how to get arch tanget for -1.16?
    When in calculator, radian mode, i use tan inver -1.16, but i cant get 2.28
     
  2. Roff

    Roff Well-Known Member

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    The tangent function repeats every π radians. For x=arctan(y), Your calculator will give you the principal value, which is located in the interval -π/2 ≤ y ≤ π/2. 2.28 is greater than π/2. Take arctan(-1.16) and add π to the result, and you will get 2.28.
     
    Last edited: Apr 29, 2009
  3. Roff

    Roff Well-Known Member

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    Did that answer your question?
     
  4. dave

    Dave New Member

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  5. shermaine

    shermaine New Member

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    yes, thanks! i got another one, inverse cos of -2/sq root 20, how do i get 242 degree?
     
  6. Miles Prower

    Miles Prower Member

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    You can't.

    arccos(-2 / sqrt(20)= 116.565deg

    360 - 116.565= 243.435deg
     

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