Evaluate for sine cosine and tangent using reference angles

The video tutorial explains how to evaluate the sine, cosine, and tangent of a negative angle, specifically -25π/4. It covers finding coterminal angles by adding 2π until a positive angle is achieved, and then determining the reference angle. The tutorial emphasizes the importance of using the smallest positive coterminal angle to find the reference angle, which shares the same coordinate points as π/4. Finally, it demonstrates how to evaluate the trigonometric functions using these reference angles, considering the signs of the coordinates in the 4th quadrant.

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