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Cos2x = 2 cos x sin x

  1. Sep 22, 2004 #1
    Can someone please help me with this one?

    cos2x = 2 cos x sin x

    I need to find 4 angles :uhh:
     
  2. jcsd
  3. Sep 22, 2004 #2

    Zurtex

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    Within what range of x? And have you checked what I posted to this problem in the other thread?
     
  4. Sep 22, 2004 #3
    within the range of 0, 360
     
  5. Sep 22, 2004 #4

    Zurtex

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    Well this is easily solvable as long as you remember these 2 identities:

    [tex]\sin 2 \theta \equiv 2 \cos \theta \sin \theta[/tex]

    and:

    [tex]\tan \theta \equiv \frac{\sin \theta}{\cos \theta}[/tex]
     
  6. Sep 22, 2004 #5
    I got it right... :rofl:
     
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