Algebra-2

To determine the coordinate point at on the unit circle, we can use the trigonometric functions sine and cosine. In this case, the angle is measured counterclockwise from the positive -axis.

The correct answer is .

Let's consider the unit circle. At , the reference angle is (). The reference angle of corresponds to the -- triangle in which the two legs have equal length and the hypotenuse has a length of .

Since the hypotenuse of the triangle is , we can use the Pythagorean theorem to find the lengths of the legs. Let's call the length of each leg

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