• #### Trigonometric Identities - Concept

##### Math›Trigonometry›Trigonometric Functions
How to use the unit circle to derive the tangent identity and the Pythagorean identity.
• #### Inverse Trigonometric Functions - Problem 2

##### Math›Geometry›Basic Trigonometry
How to use inverse trig functions to find an angle in a trapezoid.
• #### Trigonometric Identities - Concept

##### Math›Precalculus›Trigonometric Functions
How to use the unit circle to derive the tangent identity and the Pythagorean identity.
• #### Inverse Trigonometric Functions - Concept

##### Math›Precalculus›Basic Trigonometry
How to use inverse trig functions to find angles in right triangles.
• #### Angle Inclination of a Line - Problem 1

How to find the angle of inclination of a line.
• #### Angle Inclination of a Line - Problem 3

How to find the angle of inclination of a line.
• #### The Quotient Rule - Problem 3

##### Math›Calculus›Techniques of Differentiation
How to differentiate a quotient of two functions when values of a numerator and denominator are given.
• #### Angle Inclination of a Line - Problem 1

How to find the angle of inclination of a line.
• #### Angle Inclination of a Line - Problem 2

How to find the angle of inclination of a line.
• #### Inverse Trigonometric Functions - Concept

##### Math›Geometry›Basic Trigonometry
How to use inverse trig functions to find angles in right triangles.
• #### Inverse Trigonometric Functions - Problem 2

##### Math›Precalculus›Basic Trigonometry
How to use inverse trig functions to find an angle in a trapezoid.
• #### Inverse Trigonometric Functions - Problem 2

##### Math›Trigonometry›Basic Trigonometry
How to use inverse trig functions to find an angle in a trapezoid.
• #### Inverse Trigonometric Functions - Concept

##### Math›Trigonometry›Basic Trigonometry
How to use inverse trig functions to find angles in right triangles.
• #### Secants - Problem 4

##### Math›Geometry›Circles
How to fin the length of secant segments drawn from points outside a circle.
• #### Inverse Trigonometric Functions - Problem 1

##### Math›Geometry›Basic Trigonometry
How to use inverse trig functions to find angles in right triangles.
• #### Trigonometric Identities - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to use the unit circle to show that cosine is an even function, and sine and tangent are odd functions.
• #### Parts of a Circle - Problem 1

##### Math›Geometry›Geometry Building Blocks
How to classify arcs and define chords and tangents.
• #### Instantaneous Velocity - Problem 2

##### Math›Calculus›The Derivative
How to estimate the intervals of time when velocity is positive from a graph of position vs. time, and how to estimate when velocity is greatest.
• #### Inverse Trigonometric Functions - Problem 1

##### Math›Precalculus›Basic Trigonometry
How to use inverse trig functions to find angles in right triangles.
• #### The Number e and the Natural Logarithm - Concept

##### Math›Precalculus›Exponential and Logarithmic Functions
How the number e is defined.