What is the exact value of sin -840

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asked Feb 2, 2018 119k views

1 Answer

Santanu Karar · Answer 1 · 2018-02-06T23:00:01+0000

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

What is the exact value of sin -840

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