Evaluate the six trigonometric functions for the given real number

The video tutorial explains how to evaluate the six trigonometric functions for a given angle, specifically focusing on the angle -9π/4. It covers two methods: a detailed long method and a more efficient approach using coterminal and reference angles. The tutorial also demonstrates the calculation of sine, cosine, tangent, and their reciprocals, emphasizing the importance of understanding angle positions on the unit circle and the signs of coordinates in different quadrants.

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