Differentiability and Piecewise Functions
What are the three things that make a function not differentiable ? Not continuous at the point Vertical tangent line at the point A cusp at the point.
Where is the derivative undefined? 1. …at a point of discontinuity. Example: f(x) is not differentiable at x = ____
Where is the derivative undefined? 2. …where there is a vertical tangent line. Example: y = x1/3 is not differentiable at x = ___
3. …if the graph has a sharp point (cusp) Where is the derivative undefined? 3. …if the graph has a sharp point (cusp) f(x) is not differentiable at x = ____ f(x) is not differentiable at x = ____
Determine the value(s) of x at which the function is not differentiable. Give the reason.
Derivatives of piecewise functions… If then, f ’(x)= f ’(5)= f ’(-2)=
Is the function continuous? Justify your answer. Is the function differentiable at x = 1? Justify your answer.
Determine whether the function is differentiable at x = 3 Determine whether the function is differentiable at x = 3. Justify your answer.
Derivatives of Absolute value functions… If then, f ’(x)= f ’(5)= f ’(-2)=
Is the function differentiable everywhere?