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April 4th, 2017, 06:12 AM   #1
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Unhappy 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.
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April 4th, 2017, 09:30 AM   #2
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It would help if you were to type out that scribbled laundry list of questions.

... I'm not joking, either.
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April 4th, 2017, 10:19 AM   #3
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1. Hint: cos($\alpha$ - 45°) = cos($\alpha$)/√2 + sin($\alpha$)/√2

2. (cos(2x) - cos(4x))/(cos(2x) + cos(4x)) = 2sin(3x)sin(x)/(2cos(3x)cos(x)) = tan(x)tan(3x)

4. sin(40°) - cos(50°) = 0

You should learn some of the information given here.
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