Worked example using trigonometry to solve for the lengths of the sides of a right triangle given one of the non-right angles.

Worked example using trig ratios to solve for missing information and evaluate other trig ratios.

Worked example that uses the unit circle definition to evaluate trig functions. [11:24]

Visualizing changes in amplitude and period for a cosine function

A video showing where the graphs of sin and cos intersect. [11:07]

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.

Problems address the equation of a circle, basic trignometry.

Worked example where we walk through finding the major trigonometric ratios.

This video shows how to determine the amplitude and period of a trigonometric function. [8:20]

Video introducing the basic trigonometry ratios sine, cosine, and tangent.

Understanding how the amplitude and period changes as coefficients change.

Video lesson using l'Hopital's rule to find the limit of a function containing trigonometric functions.

Video about finding the equation of a trigonometric function from its graph.

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]

Sal finds trigonometric identities for sine and cosine by considering angle rotations on the unit circle. [6:13]

Sal solves a problem by considering the periodicity of the tangent function. [4:01]

In this teacher-created video, trigonometric functions are developed and explored by changing one of the angles in a right triangle. [10:57]

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]

The video from Khan Academy provides practice questions for the SAT. Watch Sal work through a harder angles, arc lengths, and trig functions problem.

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.

Relationships among the six trigonometric functions are explored in this lesson. It is 1 of 4 in the series titled "Relationships of Trigonometric Functions."

Different ways of noting angles and trigonometric functions are discussed in this lesson. It is 4 of 5 in the series titled "Trigonometic Notation."

Different ways of noting angles and trigonometric functions are discussed in this lesson. It is 1 of 5 in the series titled "Trigonometic Notation."

The practical uses of the trigonometric functions are explored here. This lesson is 2 of 6 in the series titled "Trigonometric Functions in Context."