Sal solves a challenging problem that consists of a system of three trigonometric equations and three unknowns.

Sal proves the sum of angles formula for sine, sin (a+ b) = cos (a) sin (b) + sin (a) cos (b), through a clear but rather non-intuitive proof. The proof is interesting as it uses the SOH-CAH-TOA model and requires one to recall some...

Using a similar method that he used to prove the sum of angles formula for sine, Sal shows the proof of the cosine sum of angles formula, cos (a+ b) = cos (a) cos (b) - sin (a) sin (b). This proof also uses the SOH-CAH-TOA model and some...

If solving trigonometric equations is your idea of fun, then this video is correctly titled. Sal uses trigonometric identities, the quadratic formula, and inverse trigonometric functions to solve a trigonometric equation sent in by a...

Sal solves a challenging trigonometric problem for finding the number of values of _ that satisfy several constraints over a given interval. He shows a clear step-by-step solution and uses some trigonometric identities that he derives.

In this video, Sal solves an interesting question from a college entrance exam in India that requires knowledge of arithmetic progressions, trigonometric identities, and algebra. He works through solving the problem step-by-step by...

Sal follows a format similar to the last two in the third video on inverse trigonometric functions. He finds the value for the arccos (-1/2) and shows the restricted domain of the arccos function. He also finds the value for cos(arccos...

If solving trigonometric equations is your idea of fun, then this video is correctly titled. Here Sal uses trigonometric identities, the quadratic formula, and inverse trigonometric functions to solve a trigonometric equation sent in by...

Demonstrate the derivation of the trigonometric area formula for a triangle. Using the base/height formula and the sine ratio, the lesson instructor demonstrates how to combine the two and create the formula A = 1/2absinC. The video...

Does light always travel in a straight line? The narrator of a short video discusses the path light travels when going between different mediums and points out that light will want to travel on the path that minimizes the travel time....

Video shows solving an equation with sine and cosine by using a trigonometric identity and solving the resulting quadratic equation. [10:01]

Video demonstrates solving for all possible values of theta for a trigonometric system of three equations. [11:02]

The tutorial examines how to find all the degree or radian solutions to trigonometric equations. The learning activity consists of a video with detailed explanations and a worksheet. In the left hand menu, click on Trigonometry,...

Grouping terms in order to factor a quadratic that includes trigonometric expressions is demonstrated here. This lesson is 6 of 7 in the series titled "Solving an Equation by Factoring a Trigonometric Quadratic by Grouping."

Using a half angle trigonometric identity to help solve an equation is show here. This lesson is 6 of 7 in the series titled "Solving an Equation by Applying a Half Angle Identity."

Video demonstrates solving for all possible values of theta for a trigonometric system of three equations.

Tutorial lesson explores how to solve equations with trigonometry in them. [10:05]

This video explains how to solve trigonometric equations involving multiple angles. [18:44]

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...

The process of factoring a common value or expression from multiple terms in a trigonometric equation is shown here. This lesson is 5 of 7 in the series titled "Finding a Common Factor for a Trigonometric Expression."

The process of factoring a common value or expression from multiple terms in a trigonometric equation is shown here. This lesson is 7 of 7 in the series titled "Finding a Common Factor for a Trigonometric Expression."

The process of factoring a common value or expression from multiple terms in a trigonometric equation is shown here. This lesson is 1 of 7 in the series titled "Finding a Common Factor for a Trigonometric Expression."