Welcome to Episode 4 of Season 3: Unlocking Advanced Topics! The audio outlines various foundational concepts within trigonometry. It begins by defining basic trigonometric identities for sine, cosine, and tangent using a right triangle and the mnemonic SOH CAH TOA. Furthermore, the audio expands upon these by introducing more trigonometric identities such as cosecant, secant, and cotangent, which are reciprocals of the initial three functions. Explore a table of important trigonometric values for common angles ranging from 0 to 180 degrees. Finally, it addresses unit circle identities, explaining how trigonometric functions behave with negative angles or angles relative to 180 degrees.

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