lilsis76
  • lilsis76
just a question. how can i find cos5pi/2 ? where is that on the unit circle?
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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lilsis76
  • lilsis76
so i kep going around?
anonymous
  • anonymous
5pi/2 is coterminal with pi/2

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lilsis76
  • lilsis76
what is coterminal?
anonymous
  • anonymous
an angle has a initial side (positive x-axis), and a terminal side... it means that their terminal sides are the same.
anonymous
  • anonymous
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lilsis76
  • lilsis76
oh...okay, so then pi/3 would be 15pi/3?
anonymous
  • anonymous
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.
lilsis76
  • lilsis76
hmmmm...................... :( im getting badder at this. ugh. okay ill post a new question cuz this one i superly need help on
anonymous
  • anonymous
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
lilsis76
  • lilsis76
okay, i think i see it

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