• #### The Cosine Addition Formulas - Concept

How to derive the cosine of a difference formula.
• #### Applications of Linear Equations - Problem 4

##### Math›Algebra›Linear Equations and Their Graphs
The meaning of the slope of a line in a word problem, particularly in relation to the given units
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• #### The Half-Angle Identities - Problem 2

How to use a half-angle formula to evaluate cos(105).
• #### The Reciprocal Trigonometric Functions - Concept

##### Math›Precalculus›Trigonometric Functions
How to define the reciprocal trigonometric functions, the reciprocal identities, and the Pythagorean identities.
• #### The Half-Angle Identities - Problem 2

How to use a half-angle formula to evaluate cos(105).
• #### The Tangent Function - Concept

##### Math›Precalculus›Trigonometric Functions
How to define the tangent function for all angles.
• #### The Cosine Addition Formulas - Concept

How to derive the cosine of a difference formula.
• #### The Half-Angle Identities - Problem 1

How to use a half-angle formula to evaluate sin(/8).
• #### The Reciprocal Trigonometric Functions - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to compute all six trigonometric functions at q = -7?/6.
• #### The Reciprocal Trigonometric Functions - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to compute all six trigonometric functions at q = -7?/6.
• #### The Definitions of Sine and Cosine - Problem 4

##### Math›Precalculus›Trigonometric Functions
How to determine the magnitude of sine or cosine using a unit circle diagram.
• #### Graphs of the Sine and Cosine Functions - Problem 2

##### Math›Trigonometry›Trigonometric Functions
How to graph one period of y = cos q.
• #### Graphs of the Sine and Cosine Functions - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to graph one period of y = cos q.
• #### Solving Trigonometric Equations - Problem 2

How to solve a simple tangent equation: tan(x/4)=1.
• #### The Reciprocal Trigonometric Functions - Problem 3

##### Math›Precalculus›Trigonometric Functions
How to compute all six trigonometric functions at q given sec q.
• #### The Definitions of Sine and Cosine - Problem 4

##### Math›Trigonometry›Trigonometric Functions
How to determine the magnitude of sine or cosine using a unit circle diagram.