From:	"Steven C. Hendrickson" <hendrick AT pe DOT net>
Newsgroups:	comp.os.msdos.djgpp
References:	<wKza4.591$eq DOT 7079 AT uutiset DOT nic DOT fi>
Subject:	Re: Inverse trigonometry functions in Djgpp
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The atan() function,uses radians as argument, and  delivers its answer in
radians.
Steve Hendrickson

"Jarkko Kähkönen" <jarkko DOT kahkonen AT mbnet DOT fi> wrote in message
news:wKza4.591$eq DOT 7079 AT uutiset DOT nic DOT fi...
> Atan () - don't work!
> Here is a bit of my code:
>
> float direction;
>
> direction = atan ( 120 / 90 );
> printf ("%f", direction");
>
> And output is this:
> 0.927295
>
> But with calculator it is:
> tan^-1 (120 / 90) = 53.1301023...
>
> Is atan () right inverse tan function?
>
> Greetings,
> Jarkko DOT Kahkonen AT mbnet DOT REMOVETHAT DOT fi
>
>

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