To be differentiable, a function must be continuous and smooth. Derivatives will fail to exist at: cornercusp vertical tangent discontinuity.

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Presentation transcript:

To be differentiable, a function must be continuous and smooth. Derivatives will fail to exist at: cornercusp vertical tangent discontinuity

Most of the functions we study in calculus will be differentiable.

Derivatives on the TI-89: You must be able to calculate derivatives with the calculator and without. Today you will be using your calculator, but be sure to do them by hand when called for. Remember that half the test is no calculator.

Example: Find at x = 2. d ( x ^ 3, x ) ENTER returns This is the derivative symbol, which is. 8 2nd It is not a lower case letter “d”. Use the up arrow key to highlight and press. ENTER returns or use: ENTER

Warning: The calculator may return an incorrect value if you evaluate a derivative at a point where the function is not differentiable. Examples: returns

Graphing Derivatives Graph:What does the graph look like? This looks like: Use your calculator to evaluate: The derivative of is only defined for, even though the calculator graphs negative values of x.

Two theorems: 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.

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