Trigonometry quick question

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  1. IShouldBeRevising_'s Avatar
    1 22-04-2012  15:57
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    Trigonometry quick question
    How would you find the angles using the quadrant method when given a negative number like tanx = -3
  2. Mr M's Avatar
    2 22-04-2012  15:59
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    Re: Trigonometry quick question
    Don't bother with all that.

    Just type \tan^{-1} -3 into your calculator and then add or subtract multiples of 180 degrees.
  3. IShouldBeRevising_'s Avatar
    3 22-04-2012  16:05
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    Re: Trigonometry quick question
    (Original post by Mr M)
    Don't bother with all that.

    Just type \tan^{-1} -3 into your calculator and then add or subtract multiples of 180 degrees.
    Thanks that's a much easier method, we got taught that we have to use cast diagrams
  4. mahnoorbloch's Avatar
    4 22-04-2012  17:55
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    • Posts: 57
    Re: Trigonometry quick question
    (Original post by IShouldBeRevising_)
    How would you find the angles using the quadrant method when given a negative number like tanx = -3
    by using the negative axices.
  5. mahnoorbloch's Avatar
    5 22-04-2012  17:56
    • Junior Member
    • Posts: 57
    Re: Trigonometry quick question
    (Original post by Mr M)
    Don't bother with all that.

    Just type \tan^{-1} -3 into your calculator and then add or subtract multiples of 180 degrees.
    yes your are right.
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