Solve Trig Equation: 1+cos(180+2u) let 90+u be f

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The discussion focuses on simplifying the trigonometric equation 1 + cos(180 + 2u) by letting 90 + u be represented as f. The transformation leads to the expression 1 + cos(2f), which can be further simplified using the identity cos(180 + X) = -cos(X). This results in the equation simplifying to 1 - cos(2u), allowing for further analysis and solutions.

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Lol this one troubling me badly.

Simplify 1+cos(180+2u) let 90+u be f
1+cos(2f)
then 1+ cos^2 (f) - sin^2 (f)
umm then it's 2 Cos^2 (f)

lol I'm a bit lost.

what do you after that lol, or do you do it an easier way .Thanks in advance :cry:
 
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Easier way. Dont forget that cos(180+X) = -cos(X)
Therefrore cos(180+2u) = -cos(2u). Can u go from there?
 
Ah yea. lol thanks very much. I can.
 

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