Understanding the Domain of Trigonometric Functions: Examining Denominators of Trig Ratios

This lesson explores the domain of the six trigonometric functions by examining the denominators of the trig ratios. It explains the unit circle's role in determining trig values, the reciprocal nature of certain functions, and how these functions extend beyond right triangles to circular functions. The domain of each function is discussed, particularly focusing on where they are undefined due to division by zero. The lesson emphasizes understanding the unit circle's coordinates and the importance of recognizing reciprocal pairs.

Describe the significance of quadrantal angles in trigonometry.

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How do the reciprocal functions relate to the primary trigonometric functions?

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