Khan Academy
Khan Academy: Trigonometry: Tangent Identities: Periodicity
Sal solves a problem by considering the periodicity of the tangent function. [4:01]
Other
Trigonometric Functions f.tf.4
In this teacher-created video, trigonometric functions are developed and explored by changing one of the angles in a right triangle. [10:57]
Khan Academy
Khan Academy: Algebra Ii: Trig Values of Special Angles: Triangle in Unit Circle
Sal finds the trigonometric values of pi/4 using the unit-circle definition. [7:53]
Study Pug
Study Pug: Unit Circle
In the world of calculus, pre-calculus, and trigonometry, you will often find references toward and problems regarding "the unit circle." But, oddly, we are rarely ever taught what it is! This video will change that with an in-depth...
Study Pug
Study Pug: Solving First Degree Trigonometric Equations
Trigonometric equations are just equations that feature the trigonometric ratios such as sine and cosine on the variable "x". Because of the presence of these trigonometric functions, solving these equations becomes a little more...
Sophia Learning
Sophia: Drawing an Angle on the Unit Circle: Lesson 2
Given a particular angle, this lesson demonstrates how it can be drawn on a unit circle. It is 2 of 7 in the series titled "Drawing an Angle on the Unit Circle."
Sophia Learning
Sophia: Drawing an Angle on the Unit Circle: Lesson 4
Given a particular angle, this lesson demonstrates how it can be drawn on a unit circle. It is 4 of 7 in the series titled "Drawing an Angle on the Unit Circle."
Sophia Learning
Sophia: Drawing an Angle on the Unit Circle: Lesson 7
Given a particular angle, this lesson demonstrates how it can be drawn on a unit circle. It is 7 of 7 in the series titled "Drawing an Angle on the Unit Circle."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 3
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 3 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 4
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 4 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 6
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 6 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 7
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 7 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 8
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 8 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing an Angle Over 360 Degrees: Lesson 1
This lesson show how an angle of over 360 degrees can be depicted on a unit circle. It is 1 of 8 in the series titled "Drawing an Angle Over 360 Degrees."
Sophia Learning
Sophia: Drawing a Negative Angle: Lesson 3
This lesson show haw a negative angle can be drawn on a unit circle. It is 3 of 7 in the series titled "Drawing a Negative Angle."
Sophia Learning
Sophia: Drawing a Negative Angle: Lesson 5
This lesson show haw a negative angle can be drawn on a unit circle. It is 5 of 7 in the series titled "Drawing a Negative Angle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 2
This lesson shows how to draw a right triangle on a unit circle. It is 2 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 4
This lesson shows how to draw a right triangle on a unit circle. It is 4 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 5
This lesson shows how to draw a right triangle on a unit circle. It is 5 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 6
This lesson shows how to draw a right triangle on a unit circle. It is 6 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 7
This lesson shows how to draw a right triangle on a unit circle. It is 7 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Drawing a Triangle on the Unit Circle: Lesson 1
This lesson shows how to draw a right triangle on a unit circle. It is 1 of 7 in the series titled "Drawing a Triangle on the Unit Circle."
Sophia Learning
Sophia: Finding a Missing Coordinate: Lesson 4
Given an x or y coordinate for a point on the unit circle, this lesson show how to find the other coordinate. It is 4 of 7 in the series titled "Finding a Missing Coordinate."
Sophia Learning
Sophia: Finding a Missing Coordinate: Lesson 6
Given an x or y coordinate for a point on the unit circle, this lesson show how to find the other coordinate. It is 6 of 7 in the series titled "Finding a Missing Coordinate."