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>
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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>
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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?