This lesson shows how to recognize when a tangent line is vertical by determining if the slope is undefined. It is 1 of 7 in the series titled "Finding a Vertical Tangent."

In this lesson, students see that some problems will have more than one answer. It is 1 of 5 in the series titled "Multiple Solutions."

This lesson shows how an indeterminate limit may be found by first multiplying the numerator and denominator of the function by a carefully picked factor. It is 2 of 8 in the series titled "Multiplying to Find an Indeterminate Limit."

This lesson shows how an indeterminate limit may be found by first multiplying the numerator and denominator of the function by a carefully picked factor. It is 7 of 8 in the series titled "Multiplying to Find an Indeterminate Limit."

This lesson shows how an indeterminate limit may be found by first multiplying the numerator and denominator of the function by a carefully picked factor. It is 8 of 8 in the series titled "Multiplying to Find an Indeterminate Limit."

This lesson shows how an indeterminate limit may be found by first multiplying the numerator and denominator of the function by a carefully picked factor. It is 1 of 8 in the series titled "Multiplying to Find an Indeterminate Limit."

This lesson defines the derivative in terms of a limit, as two points on a function get closer together. It is 2 of 4 in the series titled "Second Form of a Derivative."

This lesson defines the derivative in terms of a limit, as two points on a function get closer together. It is 3 of 4 in the series titled "Second Form of a Derivative."

This lesson defines the derivative in terms of a limit, as two points on a function get closer together. It is 1 of 4 in the series titled "Second Form of a Derivative."

Students see that math problems can be expressed in words in this lesson. It is 3 of 7 in the series titled "Word Problems."

Students see that math problems can be expressed in words in this lesson. It is 4 of 7 in the series titled "Word Problems."

Students see that math problems can be expressed in words in this lesson. It is 5 of 7 in the series titled "Word Problems."

Students see that math problems can be expressed in words in this lesson. It is 6 of 7 in the series titled "Word Problems."

This lesson shows how an indeterminate limit may be found for an element of the domain of a function by constructing a T chart. It is 4 of 7 in the series titled "Finding an Indeterminate Limit with a T Chart."

This lesson shows how to recognize when a tangent line is vertical by determining if the slope is undefined. It is 3 of 7 in the series titled "Finding a Vertical Tangent."

In this lesson, students see that some problems will have more than one answer. It is 3 of 5 in the series titled "Multiple Solutions."