Sine, opposite over hypotenuse, Cosine, adjacent over hypotenuse, Tangent, opposite over adjacent, Hypotenuse, longest side of right triangle, Adjacent, side next to the angle, Opposite, side across from the angle, Pythagorean identity, sin²θ plus cos²θ equals 1, Unit circle, circle with radius one, Angle of elevation, angle measured upward from horizontal, Radian, angle measure based on arc

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