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    Help with finding angles with 0 </= Angle </= 2pi ?

    I want to learn how to find the angels A with: 0, less than or equal, A ,less than or equal to, 2pi that satisfy equations such as these: sin A = -1 (I got, -90, and 90 degrees) cos A= 1 (I got, 0) sin A= 0.4 (I got, 23.5782 and 156.4218 degrees) cos A= -0.6 (I got...
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