From: "Jarkko Kähkönen" <jarkko DOT kahkonen AT mbnet DOT fi>
Newsgroups: comp.os.msdos.djgpp
Subject: Inverse trigonometry functions in Djgpp
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Date: Thu, 30 Dec 1999 04:50:08 +0200
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To: djgpp AT delorie DOT com
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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