• #### Using the Sine and Cosine Addition Formulas to Prove Identities - Problem 3

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

How to use the sine and cosine addition formulas to prove a difference formula for tangent.
• #### Using the Inverse Trigonometric Functions - Problem 2

How to find an algebraic expression that is equivalent to sec2(tan-1 x).
• #### Using the Inverse Trigonometric Functions - Problem 2

How to find an algebraic expression that is equivalent to sec2(tan-1 x).
• #### Using the Inverse Trigonometric Functions - Concept

How to evaluate expressions like tan(sin (4/5))^(-1).
• #### Using the Inverse Trigonometric Functions - Concept

How to evaluate expressions like tan(sin (4/5))^(-1).
• #### Navigation Problems - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How we find the course and groundspeed of an airplane when we are given its velocity and the wind velocity.
• #### The Circle - Problem 10

##### Math›Precalculus›Conic Sections
How to write the equation for a line that is tangent to a circle.
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• #### The Circle - Problem 10

##### Math›Algebra 2›Conic Sections
How to write the equation for a line that is tangent to a circle.
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• #### Secants - Problem 3

##### Math›Geometry›Circles
How to find the length of intersecting secant segments.
• #### Secants - Concept

##### Math›Geometry›Circles
How to define a secant; how to find the length of various secants in circles.
• #### The Circle - Problem 10

##### Math›Precalculus›Equations of Lines, Parabolas and Circles
How to write the equation for a line that is tangent to a circle.
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• #### Secants - Problem 1

##### Math›Geometry›Circles
How to find the angle measures formed by intersecting secants.
• #### The Definition of the Derivative - Concept

##### Math›Calculus›The Derivative
How to define the derivative of a function at a point x=a.
• #### Angle Inclination of a Line - Concept

How to find the angle of inclination of a line.
• #### Trigonometric Identities - Problem 1

##### Math›Precalculus›Trigonometric Functions
How to use the Pythagorean identity to find cosine and tangent when sine is known.
• #### Trigonometric Identities - Problem 1

##### Math›Trigonometry›Trigonometric Functions
How to use the Pythagorean identity to find cosine and tangent when sine is known.