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Simple Trig help

  1. Sep 29, 2005 #1


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    Lol this one troubling me badly.

    Simplify 1+cos(180+2u) let 90+u be f
    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:
  2. jcsd
  3. Sep 29, 2005 #2
    Easier way. Dont forget that cos(180+X) = -cos(X)
    Therefrore cos(180+2u) = -cos(2u). Can u go from there?
  4. Sep 29, 2005 #3


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    Ah yea. lol thanks very much. I can.
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