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November 26th, 2012, 09:42 AM  #1 
Newbie Joined: Nov 2012 Posts: 2 Thanks: 0  need the function http://i47.tinypic.com/1gowtz.png Well, I need a function which will give me resultat of coordinates. when alfa become zero or 180 degrees the coordinate Y not change; when alfa become 90 or 270 degrees the coordinate X not change; when alfa become 45 or 135 or... degrees the coordinates X and Y changing same. I thought about sin,cos but not got right solution. and my idea: y = tg(x)*k but it's not right when X become 90 degrees or 270 degrees ( k = const ). 
November 26th, 2012, 11:50 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,757 Thanks: 2138 
A function from what to what?

November 27th, 2012, 03:29 AM  #3 
Newbie Joined: Nov 2012 Posts: 2 Thanks: 0  Re: need the function
Not needed anymore, I found it's y=R*sin(alfa) x=R*cos(alfa) 

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