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What is the value of arccos(−12) in radians?

 

*  π / 3

*  5π / 6

*  π / 6

*  2π / 3

 Jul 9, 2019
 #1
avatar+105195 
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I think you  meant  :   arccos (-1/2)

 

This is a second quadrant angle whose cosine = -1/2   =   60°  in the second quadrant  = 2pi / 3

 

 

cool cool cool

 Jul 9, 2019

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