Julie99 Julie99
  • 24-09-2015
  • Mathematics
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What is cosine of 8pi/3

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adoorreji
adoorreji adoorreji
  • 24-09-2015
cos ( 8pi /3 ) = ?
= cos ( 2 pi + ( 2pi / 3) )
= cos ( 2 pi /3 ) 
=  - 1 / 2 
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