thank you gentlemen, this is what I needed. never figured out that atan is arctn.

On Sun, Feb 2, 2020 at 8:49 PM Jack <jack@rybn.org> wrote:
Hello,

You can look at :
http://yadegari.org/expr/expr.html
++

Jack



Le 02/02/2020 à 20:18, Csaba Láng a écrit :
> Dear list,
>
> how would you calculate with an expression this formula:
>
> arctg(y/x)
>
>
> looks like tan, sin, cos cannot be in the expression, does it mean I
> have to brake it into parts?
>
>
> Best,
>
>
> Popesz
>
>
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