C4oltnasanonejo
C4oltnasanonejo C4oltnasanonejo
  • 07-08-2016
  • Mathematics
contestada

Find the exact value of cos210 using the unit circle

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HomertheGenius
HomertheGenius HomertheGenius
  • 10-08-2016
cos 210° = cos ( 180° + 30° ) - cos 30° = - √3/2
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