[RESOLVED] Atan

Do I not rember my trigonometry or is there no code for 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!!

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.??

Quote:

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Originally Posted by sgrya1

Why don't they have math.ASin, Math.ACos....etc

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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.