3.3 Differentiation Rules

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3.3 Differentiation Rules

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Presentation transcript:

3.3 Differentiation Rules Colorado National Monument Greg Kelly, Hanford High School, Richland, Washington Photo by Vickie Kelly, 2003

A quick review If f has a derivative at x = a, then f is continuous at x = a. Since a function must be continuous to have a derivative, if it has a derivative then it is continuous.

p Intermediate Value Theorem for Derivatives If a and b are any two points in an interval on which f is differentiable, then takes on every value between and . Between a and b, must take on every value between and . p

If the derivative of a function is its slope, then for a constant function, the derivative must be zero. example: The derivative of a constant is zero.

We saw that if , . This is part of a pattern. examples: power rule

constant multiple rule: examples:

constant multiple rule: sum and difference rules: (Each term is treated separately)

Find the derivative of each function below

Example: Find the horizontal tangents of: Horizontal tangents occur when slope = zero. Plugging the x values into the original equation, we get: (The function is even, so we only get two horizontal tangents.)

First derivative (slope) is zero at:

product rule: Notice that this is not just the product of two derivatives. This is sometimes memorized as: (1st)(Derivative of 2nd) + (2nd)(Derivative of 1st) (Lefty(D-righty) + (Righty)(D-lefty)

quotient rule: or (Bottom)(Derivative of Top) – (Top)(Derivative of Bottom) all divided by the bottom squared (Low)(D-high) – (High)(D-low) all divided by low squared

Higher Order Derivatives: is the first derivative of y with respect to x. is the second derivative. (y double prime) is the third derivative. We will learn later what these higher order derivatives are used for. is the fourth derivative. p

Product Rule Quotient Rule (1st)(Derivative of 2nd) + (2nd)(Derivative of 1st) (Lefty)(D-righty) + (Righty)(D-lefty) Quotient Rule (Bottom)(Derivative of Top) – (Top)(Derivative of Bottom) all divided by the bottom squared (Low)(D-high) – (High)(D-low) all divided by low squared

24. Suppose u and v are differentiable functions at x = 2 Find