note 59282 added to ref.math

If you´re an aviator and needs to calculate windcorrection angles and groundspeed (e.g. during flightplanning) this can be very useful. $windcorrection = rad2deg(asin((($windspeed * (sin(deg2rad($tt - ($winddirection-180))))/$tas)))); $groundspeed = $tas*cos(deg2rad($windcorrection)) + $windspeed*cos(deg2rad($tt-($winddirection-180))); You can probably write these lines more beautiful, but they work! ---- Manual Page -- http://www.php.net/manual/en/ref.math.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+59282 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+59282&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+59282&report=yes Search -- http://master.php.net/manage/user-notes.php