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  • 10-05-2017
  • Mathematics
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What is the exact value of sin -840

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Аноним Аноним
  • 10-05-2017
first subtract  2 revolutions from the - 840 :-    (- (840-720)  = -120

This gives  sin -120  which is in the 3rd quadrant of the unit circle

sin -120  =  - sin 60  = - sqrt3/2
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