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kati45 [8]
4 years ago
12

What is the exact value of sin -840

Mathematics
1 answer:
dsp734 years ago
7 0
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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