Khan Academy
Trigonometric System Example, Trig Identities and Examples, Trigonometry
Sal solves a challenging problem that consists of a system of three trigonometric equations and three unknowns.
Khan Academy
Proof: sin(a+b)=(cos a)(sin b)+(sin a)(cos b)
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...
Khan Academy
Proof: cos(a+b)=(cos a)(cos b)-(sin a)(sin b)
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...
Khan Academy
Fun Trig Problem
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...
Curated OER
Fun Trig Problem
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...
FuseSchool
Area of a Triangle 1/2absinC Proof
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...
3Blue1Brown
Snell's Law Proof Using Springs
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....
Khan Academy
Khan Academy: Trigonometry: Fun Trig Problem
Video shows solving an equation with sine and cosine by using a trigonometric identity and solving the resulting quadratic equation. [10:01]
Khan Academy
Khan Academy: Trigonometry: Trigonometric System Example
Video demonstrates solving for all possible values of theta for a trigonometric system of three equations. [11:02]
Math TV
Math tv.com: Trigonometry: Trigonometric Equations Involving Multiple Angles
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,...
Sophia Learning
Sophia: Solving an Equation by Factoring a Trigonometric Quadratic by Grouping
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."
Sophia Learning
Sophia: Solving an Equation by Applying a Half Angle Identity: Lesson 6
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."
Khan Academy
Khan Academy: More Trig Examples: Trigonometric System Example
Video demonstrates solving for all possible values of theta for a trigonometric system of three equations.
PatrickJMT
Patrick Jmt: Solving Trigonometric Equations
Tutorial lesson explores how to solve equations with trigonometry in them. [10:05]
Study Pug
Study Pug: Solving Trigonometric Equations Involving Multiple Angles
This video explains how to solve trigonometric equations involving multiple angles. [18:44]
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: Finding a Common Factor for a Trigonometric Expression: Lesson 5
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."
Sophia Learning
Sophia: Finding a Common Factor for a Trigonometric Expression: Lesson 7
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."
Sophia Learning
Sophia: Finding a Common Factor for a Trigonometric Expression: Lesson 1
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."
Sophia Learning
Sophia: Solving an Equation by Applying a Double Angle Identity: Lesson 2
Using a double angle trigonometric identity to help solve an equation is show here. This lesson is 2 of 7 in the series titled "Solving an Equation by Applying a Double Angle Identity."
Sophia Learning
Sophia: Solving an Equation by Applying a Double Angle Identity: Lesson 3
Using a double angle trigonometric identity to help solve an equation is show here. This lesson is 3 of 7 in the series titled "Solving an Equation by Applying a Double Angle Identity."
Sophia Learning
Sophia: Solving an Equation by Applying a Double Angle Identity: Lesson 5
Using a double angle trigonometric identity to help solve an equation is show here. This lesson is 5 of 7 in the series titled "Solving an Equation by Applying a Double Angle Identity."
Sophia Learning
Sophia: Solving an Equation by Applying a Double Angle Identity: Lesson 7
Using a double angle trigonometric identity to help solve an equation is show here. This lesson is 7 of 7 in the series titled "Solving an Equation by Applying a Double Angle Identity."
Sophia Learning
Sophia: Solving an Equation by Applying a Half Angle Identity: Lesson 3
Using a half angle trigonometric identity to help solve an equation is show here. This lesson is 3 of 7 in the series titled "Solving an Equation by Applying a Half Angle Identity."