• #### The Cosine Addition Formulas - Concept

##### Math›Trigonometry›Advanced Trigonometry
How to derive the cosine of a difference formula.
• #### The Cosine Addition Formulas - Concept

##### Math›Precalculus›Advanced Trigonometry
How to derive the cosine of a difference formula.
• #### The Cosine Addition Formulas - Problem 1

##### Math›Trigonometry›Advanced Trigonometry
How to use the cosine of a difference formula to simplify an expression or to find the cosine of an angle.
• #### The Cosine Addition Formulas - Problem 1

##### Math›Precalculus›Advanced Trigonometry
How to use the cosine of a difference formula to simplify an expression or to find the cosine of an angle.
• #### Using the Sine and Cosine Addition Formulas to Prove Identities - Problem 3

##### Math›Trigonometry›Advanced Trigonometry
How to use the sine and cosine addition formulas to prove a difference formula for tangent.
• #### Using the Sine and Cosine Addition Formulas to Prove Identities - Problem 3

##### Math›Precalculus›Advanced Trigonometry
How to use the sine and cosine addition formulas to prove a difference formula for tangent.
• #### The Cosine Addition Formulas - Problem 3

##### Math›Trigonometry›Advanced Trigonometry
How to evaluate cos(a ? b) and cos(a + b) when you know only sin(a) and cos(b).
• #### The Cosine Addition Formulas - Problem 3

##### Math›Precalculus›Advanced Trigonometry
How to evaluate cos(a ? b) and cos(a + b) when you know only sin(a) and cos(b).
• #### The Sine Addition Formulas - Concept

##### Math›Trigonometry›Advanced Trigonometry
How to derive the sine of a sum formula.
• #### The Sine Addition Formulas - Concept

##### Math›Precalculus›Advanced Trigonometry
How to derive the sine of a sum formula.
• #### Converting from Polar Coordinates to Rectangular - Problem 3

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to convert a polar equation, 2/(cos(tehta)-(pi/2)), into rectangular form, and describe the shape of its graph.
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