April 4th, 2017, 05:12 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 09:15 AM. 
April 4th, 2017, 08:30 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,604 Thanks: 1290  It would help if you were to type out that scribbled laundry list of questions. ... I'm not joking, either. 
April 4th, 2017, 09:19 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 17,722 Thanks: 1359 
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. 

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cos, help!, sin, trigometry, trigonometry 
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