A skill that allows you to practice your knowledge of the unit circle. The skill will ask you for the sin or cosine of a value in radians or degrees. The skill will let you know if you were correct or not. These are the possible answers that the skill will accept: "1 divided by 2","square root of 3 divided by 2", "1", 0","negative 1 divided by 2","negative square root of 3 divided by 2", negative 1".
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