Simplifying a rational trigonometric expression by using conjugate of the denominator

The video tutorial explains how to simplify a trigonometric expression using conjugates and Pythagorean identities. It begins with an introduction to the problem and examples of simplifying expressions with rational and imaginary numbers. The teacher demonstrates the use of conjugates to eliminate denominators and applies this method to the given problem. By creating a difference of squares, the expression is further simplified using Pythagorean identities, leading to the final simplified result.

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