• #### Find an Equation for the Sine or Cosine Wave - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to identify the graph of a stretched and shifted cosine curve.
• #### Graphs of the Sine and Cosine Functions - Concept

##### Math›Trigonometry›Trigonometric Functions
How to define periodic functions.
• #### Graphs of the Sine and Cosine Functions - Concept

##### Math›Precalculus›Trigonometric Functions
How to define periodic functions.
• #### Transforming the Graphs of Sine and Cosine - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to graph a stretched cosine function.
• #### More Transformations of Sine and Cosine - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to graph a stretched and shifted cosine function.
• #### Transforming the Graphs of Sine and Cosine - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to graph a stretched cosine function.
• #### More Transformations of Sine and Cosine - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to graph a stretched and shifted cosine function.
• #### Transforming the Graphs of Sine and Cosine - Problem 3

##### Math›Trigonometry›Trigonometric Functions
How to graph a stretched cosine function with an integer period.
• #### Transforming the Graphs of Sine and Cosine - Problem 3

##### Math›Precalculus›Trigonometric Functions
How to graph a stretched cosine function with an integer period.
• #### Solving Trigonometric Equations - Concept

How to solve a simple sine equation: sin (theta) = 1/2.
• #### Solving Trigonometric Equations - Concept

How to solve a simple sine equation: sin (theta) = 1/2.
• #### The Double-Angle Formulas - Concept

How to use the sine and cosine addition formulas to prove the double-angle formulas.
• #### The Double-Angle Formulas - Concept

How to use the sine and cosine addition formulas to prove the double-angle formulas.
• #### The Tangent Function - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to find when sine, cosine, and tangent are positive.
• #### The Tangent Function - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to find when sine, cosine, and tangent are positive.
• #### Trigonometric Identities - Problem 3

##### Math›Precalculus›Trigonometric Functions
How to use the unit circle to show that sine and cosine have period 2*pi, and tangent has period pi.
• #### Trigonometric Identities - Problem 3

##### Math›Trigonometry›Trigonometric Functions
How to use the unit circle to show that sine and cosine have period 2*pi, and tangent has period pi.