myrk
myrk
10-05-2017
Mathematics
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What is the exact value of sin -840
Respuesta :
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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