10-05-2017
Mathematics

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What is the exact value of sin -840

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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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pls solve I've tried but got it wrong