• #### The Law of Cosines - Concept

##### Math›Precalculus›Basic Trigonometry
How to define and use the law of cosines.
• #### The Law of Cosines - Concept

##### Math›Trigonometry›Basic Trigonometry
How to define and use the law of cosines.
• #### The Law of Cosines - Concept

##### Math›Geometry›Basic Trigonometry
How to define and use the law of cosines.
• #### The Law of Cosines - Problem 1

##### Math›Geometry›Basic Trigonometry
How to use the law of cosines to find a missing side in a triangle.
• #### The Law of Cosines - Problem 2

##### Math›Geometry›Basic Trigonometry
How to use the law of cosines to find a missing angle given three sides in a triangle.
• #### The Law of Cosines - Problem 1

##### Math›Trigonometry›Basic Trigonometry
How to use the law of cosines to find a missing side in a triangle.
• #### The Law of Cosines - Problem 1

##### Math›Precalculus›Basic Trigonometry
How to use the law of cosines to find a missing side in a triangle.
• #### The Law of Cosines - Problem 2

##### Math›Trigonometry›Basic Trigonometry
How to use the law of cosines to find a missing angle given three sides in a triangle.
• #### The Law of Cosines - Problem 2

##### Math›Precalculus›Basic Trigonometry
How to use the law of cosines to find a missing angle given three sides in a triangle.
• #### The Cosine Addition Formulas - Concept

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

How to derive the cosine of a difference formula.
• #### The Resultant of Two Forces - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How to find the resultant of two forces.
• #### The Resultant of Two Forces - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How to find the resultant of two forces at an acute angle (45 degrees).
• #### Navigation Problems - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How we find the course and groundspeed of a complicated airplane problem when we are given its velocity and the wind velocity at 210 and 270 degrees.
• #### Navigation Problems - Problem 3

##### 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 Angle Between Vectors - Problem 4

##### Math›Precalculus›Vectors and Parametric Equations
How to derive the formula for the angle between two vectors.
• #### The Resultant of Two Forces - Problem 3

##### Math›Precalculus›Vectors and Parametric Equations
How to find the resultant of two forces.
• #### The Distance Formula in Polar Coordinates - Concept

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to derive the distance formula for polar coordinates.