Message-ID:	<386ADB08.76641F56@caresystems.com.au>
Date:	Thu, 30 Dec 1999 14:09:44 +1000
From:	leon <Leon AT caresystems DOT com DOT au>
X-Mailer:	Mozilla 4.7 [en] (Win95; I)
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To:	djgpp AT delorie DOT com
Subject:	Re: Inverse trigonometry functions in Djgpp
References:	<wKza4.591$eq DOT 7079 AT uutiset DOT nic DOT fi>
Reply-To:	djgpp AT delorie DOT com

"Jarkko Kähkönen" wrote:

> 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

what are the input units for Atan() ? eg radians, degrees?

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