• #### The Half-Angle Identities - Problem 2

How to use a half-angle formula to evaluate cos(105).
• #### The Half-Angle Identities - Problem 1

How to use a half-angle formula to evaluate sin(/8).
• #### The Sine Addition Formulas - Concept

How to derive the sine of a sum formula.
• #### Angle Inclination of a Line - Problem 2

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.
• #### Angle Inclination of a Line - Concept

How to find the angle of inclination of a line.
• #### Angle Inclination of a Line - Problem 1

How to find the angle of inclination of a line.
• #### Transforming the Graphs of Sine and Cosine - Problem 1

##### Math›Trigonometry›Trigonometric Functions
How to graph a stretched sine function.
• #### Square Root Operations - Concept

##### Math›Trigonometry›Pythagorean Theorem
How to simplify square roots using two different methods.
• #### The Definitions of Sine and Cosine - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to find the sine of an angle when its cosine is given.
• #### Transforming the Graphs of Sine and Cosine - Concept

##### Math›Trigonometry›Trigonometric Functions
How the values of A and B affect the shape of the graph y = A sin(Bx).
• #### Transforming the Graphs of Sine and Cosine - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to graph a stretched cosine function.
• #### The Reciprocal Trigonometric Functions - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to compute all six trigonometric functions at q = -7?/6.
• #### Transforming the Cotangent Graph - Problem 3

##### Math›Trigonometry›Trigonometric Functions
How to graph a transformation of the cotangent function.
• #### Transforming Secant and Cosecant - Concept

##### Math›Trigonometry›Trigonometric Functions
How graph the secant function using five key points.
• #### The Sine Addition Formulas - Problem 1

How to use the sine of a sum formula to simplify an expression or to find the sine of an angle.
• #### The Half-Angle Identities - Concept

How to use the power reduction formulas to derive the half-angle formulas.
• #### Pythagorean Theorem Proofs - Problem 1

##### Math›Trigonometry›Pythagorean Theorem
How to prove the Pythagorean Theorem by rearranging triangles inside a square.
• #### Radian Measure of Angles - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to convert to radians when degrees are given.
• #### Pythagorean Theorem Proofs - Problem 2

##### Math›Trigonometry›Pythagorean Theorem
How to use the Pythagorean Theorem to determine if a triangle is acute, right, or obtuse, given the lengths of the triangle.