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Thread: [RESOLVED] Atan

  1. Sep 25th, 2006, 05:41 PM #1
    sgrya1
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    Resolved [RESOLVED] Atan

    Do I not rember my trigonometry or is there no code for ATAN ?
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  2. Sep 25th, 2006, 05:51 PM #2
    Harsh Gupta
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    Re: Atan

    VB 6 have Math.Atn and .Net has Math.Atan method.

    Or are you looking for pure Trig based functions to calculate Tan-1. Take a look here.

    The theory in the link looks kinda too much!!
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  3. Sep 25th, 2006, 06:06 PM #3
    sgrya1
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    Re: Atan

    Could have sorted this out. Will check tomorrow. Why don't they have math.ASin, Math.ACos....etc

    Don't understand, most of those functions work on there own without math.??
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  4. Sep 26th, 2006, 03:12 AM #4
    krtxmrtz
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    Re: Atan

    Quote Originally Posted by sgrya1
    Why don't they have math.ASin, Math.ACos....etc
    I don't know, maybe to save code ? At any rate you can derive ASIN and ACOS from ATAN. For example, if you want to calculate a knowing that a=ASIN(x), then

    tan(a) = sin(a) / cos(a) = sin(a) / Sqrt(1 - sin2(a)) = x / Sqrt(1 - x2)

    so that

    a = ATAN (x / Sqrt(1 - x2))

    And for ACOS it's analogous.
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