Pre-Calculus - Simplify expressions using fundamental identities, cot(pi/2 - x) . cosx

The video tutorial explains the concept of cofunction identities in trigonometry. It begins with an introduction to the importance of remembering these identities. The teacher then demonstrates how to rewrite the cotangent of π/2 - X using cofunction identities, showing that it equals the tangent of X. The tutorial continues with a step-by-step simplification of a trigonometric expression, using quotient identities to express tangent as sine over cosine, ultimately simplifying the expression to sine of X.

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