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Trigonometric identity

  1. May 3, 2007 #1
    Which trigonometric identitiy are used to transform 2(cos(x))^2+2cos(x)sin(x) into 0?
  2. jcsd
  3. May 3, 2007 #2


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    If you want to show that [tex]2\cos^2 x + 2\cos x \sin x = 0[/tex] identically, you can't because it isn't true.

    If you want to solve the equation [tex]2\cos^2 x + 2\cos x \sin x = 0[/tex] that's a different matter entirely. So what is it you want to do?
  4. May 3, 2007 #3
    Sorry, I gave you the wrong eq. Solved in on my own here.

    What's up in Singapore?
  5. May 3, 2007 #4


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    Mostly the sky, I guess. :tongue2:
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