
Trigonometry Trigonometry Math Forum 
 LinkBack  Thread Tools  Display Modes 
February 7th, 2013, 07:06 AM  #1 
Senior Member Joined: Sep 2012 Posts: 201 Thanks: 1  Cosine graph, sine graph basics confusion
I have gotten a bit confused to why these rules work for sine and cosine graphs. My confusion stems from I can't really see what they mean literally. The rules are: sin x = sin(180+x) and cos x = cos(360x). I know it has something to do with symmetry, but I can't seem to connect the dots. Thanks in advance. 
February 7th, 2013, 09:07 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,704 Thanks: 1528 
The first rule should be sin x = sin(180+x). Have you looked at the graphs of sin(x) and cos(x) to see what symmetries exist? Alternatively, consider how these functions are defined in relation to the unit circle and what symmetries of the unit circle correspond to the two rules.


Tags 
basics, confusion, cosine, graph, sine 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Graph theory: Linking graph characteristics and minimal cut  avnerg  Applied Math  0  September 18th, 2013 06:03 AM 
Help with basics of features of a graph  milly20122013  Calculus  3  September 6th, 2012 12:10 PM 
[Solved] how to move point x, on a sine graph?  peaceofmind  Trigonometry  3  April 21st, 2011 11:09 PM 
graph theory  social networks and reverting the graph  johnyjj2  Applied Math  0  December 28th, 2010 02:49 PM 
Basics in Graph theory  sunflower  Applied Math  3  October 5th, 2010 09:37 AM 