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lilsis76 Group Title

just a question. how can i find cos5pi/2 ? where is that on the unit circle?

  • 2 years ago
  • 2 years ago

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  1. Kyleia Group Title
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    |dw:1351751989230:dw|

    • 2 years ago
  2. lilsis76 Group Title
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    so i kep going around?

    • 2 years ago
  3. ByteMe Group Title
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    5pi/2 is coterminal with pi/2

    • 2 years ago
  4. lilsis76 Group Title
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    what is coterminal?

    • 2 years ago
  5. ByteMe Group Title
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    an angle has a initial side (positive x-axis), and a terminal side... it means that their terminal sides are the same.

    • 2 years ago
  6. ByteMe Group Title
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    |dw:1351738068822:dw|

    • 2 years ago
  7. lilsis76 Group Title
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    oh...okay, so then pi/3 would be 15pi/3?

    • 2 years ago
  8. ByteMe Group Title
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    no... they have to differ by MULTIPLES of 2pi... notice that 5pi/2 = 2pi + pi/2 but 15pi/3 = 5pi, not a multiple of 2pi.

    • 2 years ago
  9. lilsis76 Group Title
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    hmmmm...................... :( im getting badder at this. ugh. okay ill post a new question cuz this one i superly need help on

    • 2 years ago
  10. ByteMe Group Title
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    think of it this way.... they differ by 2pi because 2pi is just a full rotation... so think of 30 degrees... 30 degrees is coterminal with 390 degrees because all you're doing is adding a full rotation 360 degrees: 30 + 360 = 390

    • 2 years ago
  11. lilsis76 Group Title
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    okay, i think i see it

    • 2 years ago
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