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What is the exact value of sin -840
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What is the exact value of sin -840
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Feb 2, 2018
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What is the exact value of sin -840
Mathematics
high-school
Craig Labenz
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Craig Labenz
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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
Santanu Karar
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Feb 7, 2018
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Santanu Karar
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