1. Registered User
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Does anyone know how to compute the Arc sin of a given sin of an angle?
Acce\$\$ doesn't have Arc Sin it has only atn Arc Tan....
Thanks

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do you have to know the arc of an angle, where sin is given?

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maybe this can be of use :

A circle does have 2*PI radians, which is equal to 360&#176;, so

1&#176; = 2 PI / 360

and

0.25*PI = 45&#176;
0.50*PI = 90&#176;
0.75*PI = 135&#176;
1*PI = 180&#176;

so if given sin is known then also the degrees are known, in which case you can multiply the degrees with (2PI/360)

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Thank you for your answer, I'll let you know with my test.

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It seems you are supposed to derive it. Access he give the formula as:

Arcsin(X) = Atn(X / Sqr(-X * X + 1))

Look in help under "derived functions" if you need any others.
hth
Chris

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Originally Posted by howey
It seems you are supposed to derive it. Access he give the formula as:

Arcsin(X) = Atn(X / Sqr(-X * X + 1))

Look in help under "derived functions" if you need any others.
hth
Chris
Yes, you are right,
here is a function
PHP Code:
``` Function ArcSin(Num As Double) As Double  If Abs(Num) <> 1 Then       ArcSin = Atn(Num / Sqr(Abs(1 - Num ^ 2)))  Else    ArcSin = 0  End IfEnd Function  ```
I tested it and gives reasonable results
Thanks agian

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