Perform subtraction of two functions and then evaluate

The video tutorial explains how to perform operations on functions, specifically focusing on subtracting one function from another (F-G) and evaluating the result for a specific input value, such as 3T. The instructor provides a step-by-step guide on rewriting the function, distributing the negative sign, and combining like terms. The tutorial also includes examples to illustrate the concept of evaluating functions and emphasizes the importance of careful subtraction and simplification.

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