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I Why trigonometric ratios were defined for a unit circle

  1. Apr 27, 2016 #1
    To make it useful for any angles. I need a good explanation for this.
  2. jcsd
  3. Apr 27, 2016 #2


    Staff: Mentor

    Think about the advantage of having a circle of radius 1. What does the sin and cos of any angle reduce to?
  4. Apr 27, 2016 #3
    Y and x okkk ,
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