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why does it end up in minus when i do like this cos(20*5). But not cos(20)*5

 Apr 7, 2021
 #1
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Assuming the angels are in degrees:

 

because the first one is  cos(100) which is in the second quadrant so it is negative.

and

the second one is 5cos(20) = pos since cos(20) is positive.

 Apr 7, 2021

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