#31803 [NEW]: Erro in Cos function

From: thiago_mata at yahoo dot com dot br Operating system: Windows XP PHP version: 4.3.10 PHP Bug Type: Safe Mode/open_basedir Bug description: Erro in Cos function Description: ------------ The funcion cos it is not return the espected result. While the sin it is ok. Reproduce code: --------------- $Angulo = Pi()/2; print "cos(Angulo) = ".cos($Angulo)."<BR>\n"; print "cos(Pi/2) = ".cos(Pi()/2)."<BR>\n"; print "Angulo = $Angulo <br>\n"; $cos = sqrt(1 - sin($Angulo)*sin($Angulo)); print "Coseno = ".cos($Angulo)."<br>\n Cos = ".$cos."<BR>\n"; print "Seno = ".sin($Angulo)."<BR>\n"; Expected result: ---------------- cos(Angulo) = 0 cos(Pi/2) = 0 Angulo = 1.5707963267949 Coseno = 0 Cos = 0 Seno = 1 Actual result: -------------- cos(Angulo) = 6.1230317691119E-017 cos(Pi/2) = 6.1230317691119E-017 Angulo = 1.5707963267949 Coseno = 6.1230317691119E-017 Cos = 0 Seno = 1 -- Edit bug report at http://bugs.php.net/?id=31803&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=31803&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=31803&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=31803&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=31803&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=31803&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=31803&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=31803&r=needscript Try newer version: http://bugs.php.net/fix.php?id=31803&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=31803&r=support Expected behavior: http://bugs.php.net/fix.php?id=31803&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=31803&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=31803&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=31803&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=31803&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=31803&r=dst IIS Stability: http://bugs.php.net/fix.php?id=31803&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=31803&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=31803&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=31803&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=31803&r=mysqlcfg