Quick trig question

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  1. IShouldBeRevising_'s Avatar
    1 17-05-2012  23:14
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    Quick trig question


    how does the above =
    tan2x = 1
  2. nohomo's Avatar
    2 17-05-2012  23:17
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    Re: Quick trig question
    Divide both sides by \cos 2x and you obtain \tan 2x = -1

    edit: when division by \cos 2x isn't allowed, i.e. when \cos2x = 0,x = k\pi+\frac{\pi}{2}, it is clear that \tan 2x = -1 and \sin 2x = -\cos 2x
    Last edited by nohomo; 17-05-2012 at 23:36.
  3. Intriguing Alias's Avatar
    3 17-05-2012  23:20
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    Re: Quick trig question
    (Original post by IShouldBeRevising_)


    how does the above =
    tan2x = 1
    It doesn't.
  4. IShouldBeRevising_'s Avatar
    4 17-05-2012  23:28
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    Re: Quick trig question
    (Original post by hassi94)
    It doesn't.
    tan 2x = -1 *
  5. Intriguing Alias's Avatar
    5 17-05-2012  23:48
    • TSR Idol
    • Location: Yorkshire
    Re: Quick trig question
    (Original post by IShouldBeRevising_)
    tan 2x = -1 *
    Divide both sides by cos2x.
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