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Im a bit confused, are the values going to be the same on the unit circle for cos and sin, even though the radian is negative?

Guest Feb 27, 2017
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cos (-2pi/3)   = 

 

cos (2pi - 2pi/3)   =  cos ( [ 6pi - 2pi] / 3)  =  cos (4pi / 3) =  cos(240°)  =  -1/2

 

And sine of the same  angle  =  -√3 / 2

 

 

cool cool cool 

CPhill  Feb 27, 2017

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