Khan Academy
Khan Academy: Factoring Quadratics: Example 4: Factoring by Grouping
Factoring trinomials by grouping.
Khan Academy
Khan Academy: Unit Circle: Unit Circle Definition of Trig Functions
In this video tutorial students extend SOH CAH TOA trigonometric relationships so that we can define trig functions for a broader class of angles.
Khan Academy
Khan Academy: Trig Substitution: Trig Substitution With Tangent
Students can watch a short video to review using the tangent for trig substitution.
Khan Academy
Khan Academy: Trig to Solve the Sides and Angles of a Right Triangle
Worked example using trigonometry to solve for the lengths of the sides of a right triangle given one of the non-right angles.
Khan Academy
Khan Academy: Using Trig to Solve for Missing Information
Worked example using trig ratios to solve for missing information and evaluate other trig ratios.
Khan Academy
Khan Academy: Example: Trig Function Values Using Unit Circle Definition
Worked example that uses the unit circle definition to evaluate trig functions. [11:24]
Khan Academy
Khan Academy: Amplitude and Period Cosine Transformations
Visualizing changes in amplitude and period for a cosine function
Khan Academy
Khan Academy: Graphs of Trig Functions: Example: Intersection of Sine and Cosine
A video showing where the graphs of sin and cos intersect. [11:07]
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Basic Trigonometry Ii
A few more examples using SOH CAH TOA. Examples of finding sine, cosine and tangent for two different right triangles, including finding side lengths by the Pythagorean Theorem and rationalizing the denominator.
Khan Academy
Khan Academy: Geometry: Basic Trigonometry
Problems address the equation of a circle, basic trignometry.
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Example: The Six Trig Ratios
Worked example where we walk through finding the major trigonometric ratios.
Khan Academy
Khan Academy: Amplitude & Period of Sinusoidal Functions From Equation
This video shows how to determine the amplitude and period of a trigonometric function. [8:20]
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Basic Trigonometry
Video introducing the basic trigonometry ratios sine, cosine, and tangent.
Khan Academy
Khan Academy: Graphs of Trig Functions: Amplitude and Period Transformations
Understanding how the amplitude and period changes as coefficients change.
Khan Academy
Khan Academy: L'hopital's Rule: L'hopital's Rule Example 1
Video lesson using l'Hopital's rule to find the limit of a function containing trigonometric functions.
Khan Academy
Khan Academy: Determining the Equation of a Trigonometric Function
Video about finding the equation of a trigonometric function from its graph.
Imagine Learning Classroom
Learn Zillion: Find Tangent Value Using Side Ratios
In this lesson, you will learn how the ratios of certain sides of the triangle determine the tangent value of a particular angle by using properties of similar triangles. [2:13]
Khan Academy
Khan Academy: Trigonometry: Sine & Cosine Identities: Periodicity
Sal finds trigonometric identities for sine and cosine by considering angle rotations on the unit circle. [6:13]
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]
Other
Even and Odd Trigonometric Functions
Produced by a teacher at a school in Jacksonville, FL, this video discusses whether the six trig functions are odd or even functions. [7:14]
Khan Academy
Khan Academy: Angles, Arc Lengths, and Trig Functions Harder Example
The video from Khan Academy provides practice questions for the SAT. Watch Sal work through a harder angles, arc lengths, and trig functions problem.
Khan Academy
Khan Academy: Angles, Arc Lengths, and Trig Functions Basic Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a basic angles, arc lengths, and trig functions problem.
Sophia Learning
Sophia: Relationships of Trigonometric Functions: Lesson 1
Relationships among the six trigonometric functions are explored in this lesson. It is 1 of 4 in the series titled "Relationships of Trigonometric Functions."