April 4th, 2017, 06:12 AM  #1 
Newbie Joined: Apr 2017 From: bulgaria Posts: 1 Thanks: 0  Trigonometry help! Please help me. This is a test which our prof will give us... or at least a similar one, but we haven't solved any similar problems like these.... I am not joking! Last edited by skipjack; April 4th, 2017 at 10:15 AM. 
April 4th, 2017, 09:30 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,773 Thanks: 1427  It would help if you were to type out that scribbled laundry list of questions. ... I'm not joking, either. 
April 4th, 2017, 10:19 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 19,866 Thanks: 1833 
1. Hint: cos($\alpha$  45Â°) = cos($\alpha$)/âˆš2 + sin($\alpha$)/âˆš2 2. (cos(2x)  cos(4x))/(cos(2x) + cos(4x)) = 2sin(3x)sin(x)/(2cos(3x)cos(x)) = tan(x)tan(3x) 4. sin(40Â°)  cos(50Â°) = 0 You should learn some of the information given here. 

Tags 
cos, help!, sin, trigometry, trigonometry 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
trigonometry  rakmo  Trigonometry  4  July 6th, 2013 03:45 PM 
Trigonometry  strangepath  Trigonometry  1  June 19th, 2013 08:25 AM 
Trigonometry  johnny  Algebra  6  March 7th, 2011 02:06 PM 
Trigonometry  johnny  Algebra  6  March 1st, 2011 07:58 AM 
trigonometry  willab  Algebra  2  October 11th, 2010 02:11 PM 