I know that the Identity is, Cos(-theta) = Cos theta. So, if Cos Theta = -.65, then Cos (-theta) = -.65.......My original answer was Cos (-theta) = .65.......Not sure why it is -.65. Could someone steer me in the right direction here. Thanks

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- March 16th 2010, 10:55 AMBrndo4uSimple Neg-Angle ID question.
I know that the Identity is, Cos(-theta) = Cos theta. So, if Cos Theta = -.65, then Cos (-theta) = -.65.......My original answer was Cos (-theta) = .65.......Not sure why it is -.65. Could someone steer me in the right direction here. Thanks

- March 16th 2010, 11:52 AMskeeter