anonymous
  • anonymous
How to find exact value... of sin (2π)/3
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
what do you mean? with what means? calculator, sequence, approximation?
radar
  • radar
\[\sqrt{3}/2\]
radar
  • radar
Refer to the unit circle

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anonymous
  • anonymous
Remember that pi is equal to 180 degrees and 2pi is 360 degrees. So, this one is 360/3 or 120 degrees. This angle is in the 2nd quadrant and the angle of reference (always from the x axis) is 60 degrees. The sin of 60 is the square root of 3 over 2. And, since it's in the 2nd quadrant, it is positive. Remember sin is positive in the 1st and 2nd quadrant and negative in the 3rd and 4th.
radar
  • radar
Good answer Beeb
anonymous
  • anonymous
stole it though...but your hint made me look it up
anonymous
  • anonymous
\[what is \sin 2\pi ? \it is 0 do you mean \sin(2\pi/3)? this is the same as \sin \pi/3\] beep and radar gave you good hints
radar
  • radar
Should be helpful to alive

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