Khan Academy
Khan Academy: Trigonometry: Inverse Trig Functions: Arcsin
Video introduces the arcsine function. Includes examples of finding the arcsine using knowledge of the unit circle. Includes link to additional practice problems. [10:36]
Sophia Learning
Sophia: Secant and Cosine: Lesson 1
Relationships between the graphs of secant and cosine are explored in this lesson. It is 1 of 5 in the series titled "Secant and Cosine."
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Using Trig Functions Part Ii
A couple of more examples of using Trig functions to solve the sides of a triangle. This video use the basic trigonometric functions to determine unknown side lengths of a right triangle. Example shows using trigonometry as well as the...
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Using Trig Functions
Video using the basic trigonometric functions to find the length of a side in a right triangle. Examples are given with angle measures in radians.
Khan Academy
Khan Academy: Inverse Trig Functions: Inverse Trig Functions: Arcsin
Introduction to the inverse trig function arcsin. Includes examples of finding the arcsine using knowledge of the unit circle.
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.
Sophia Learning
Sophia: Identifying Trigonometric Ratios From a Right Triangle
Use a right triangle to identify the six trigonometric ratios such as cosine, sine, tangent, co-secant, secant, and cotangent. Assess learning with a quiz. [6:54]
Khan Academy
Khan Academy: Unit Circle: Example: The Signs of Sine and Cosecant
Using the unit circle definition to think about the signs of the sine and the cosecant of a negative angle. [3:19]
Khan Academy
Khan Academy: Example: Unit Circle Definition to Calculate Sin and Cos
Explains how to use the unit circle definition to calculate sin and cos of multiple angles. [15:26]
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: 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: 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: 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...
Khan Academy
Khan Academy: Trig Challenge Problem: Verify Identities
Sal is given a diagram with multiple right triangles and is asked to verify identities relating to trig ratios in those triangles.
Khan Academy
Khan Academy: Trig Challenge Problem: Trig Values & Side Ratios
Sal is given a diagram with multiple right triangles and is asked to match different expressions with different trig values.
Khan Academy
Khan Academy: Trigonometric Ratios in Right Triangles
Sal shows a few examples where he starts with the two legs of a right triangle and he finds the trig ratios of one of the acute angles.
Khan Academy
Khan Academy: Intro to the Trigonometric Ratios
Sal introduces sine, cosine, and tangent, and gives an example of finding them for a given right triangle.
Khan Academy
Khan Academy: Solving for a Side in Right Triangles With Trigonometry
Sal is given a right triangle with an acute angle of 65 degrees and a leg of 5 units, and he uses trigonometry to find the two missing sides.
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."