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81=cosx how do i solve x i did the cos-1 and it keeps giving me error i know i do oposite operations

Guest Feb 18, 2017
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The cosine  returns values between  -1 and 1. inclusively....so....

 

cos x  = 81   is undefined.....however....maybe you're trying to find the cosine of 81°  ??

 

cos (81°)   = 0.15643446504

 

 

cool cool cool

CPhill  Feb 18, 2017

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