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  • 19-02-2018
  • Mathematics
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How to find the value of
cos (-1380°)

How to find the value of cos 1380 class=

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Аноним Аноним
  • 19-02-2018
Divide -1380 by 360   gives -3.83333333

360 * -3.8333333 = -300 

That is equivalent to 60 degrees

cos 60 = 1/2

Answer is 1/2
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