Pre-Calculus - Learn how to simplify a trigonometric expression using cofunction identities

The video tutorial covers the concept of cofunction identities in trigonometry, focusing on the relationship between cosine and sine. It explains how the cosine of an angle subtracted from 90 degrees is equal to the sine of that angle, using both degree and radian measures. The tutorial further simplifies trigonometric expressions by transforming secant into a reciprocal identity and ultimately deriving the tangent function. The session concludes with a review of these key concepts, emphasizing the equivalence of angles in different units.

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