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how do u do cos w/ a negative one like cos(90) but w/ a negative one like cos-1(9/4)

 May 11, 2017
 #1
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First press the 2nd button in the top left, then press "acos"

 

Also, you can type in " acos(  ) ," " arccos(  ) ," or " cos^-1(  ) " into the bar

 May 11, 2017

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