note 68670 added to function.acos

Wondering what is the use of 'acos' function? It is essential in games, animations and drawings to determine the location of two objects relating to each other. To the point: the angle of two vectors is calculated by v1X*v2X + v1Y*v2Y acos(--------------------------)=angle between two vectors. |v1| * |v2| |v1| and |v2| are the length of the vectors and calculated using Pithagoras-formula: |v1|=sqrt(v1X*v1X + v1Y*v1Y) This helped me to calculate and share given space for 'n' amount of objects so that they don't overlap. Enjoy! :-) ---- Server IP: 80.81.171.181 Probable Submitter: 88.112.11.60 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/function.acos.php Edit -- https://master.php.net/note/edit/68670 Del: integrated -- https://master.php.net/note/delete/68670/integrated Del: useless -- https://master.php.net/note/delete/68670/useless Del: bad code -- https://master.php.net/note/delete/68670/bad+code Del: spam -- https://master.php.net/note/delete/68670/spam Del: non-english -- https://master.php.net/note/delete/68670/non-english Del: in docs -- https://master.php.net/note/delete/68670/in+docs Del: other reasons-- https://master.php.net/note/delete/68670 Reject -- https://master.php.net/note/reject/68670 Search -- https://master.php.net/manage/user-notes.php