Instructional Video0:50
Brian McLogan

Learn how to use sum and difference formulas to write as one trigonometric expression

12th - Higher Ed
👉 Learn how to write a given sum or difference of two angles formula expression as a single sum/difference of angles trigonometric function. To do this, we first identify the trigonometric function for which its sum/difference formula is...
Instructional Video3:47
Brian McLogan

Pre-Calculus - Find All of the Solutions of an Equation Using the Double Angle Formulas

12th - Higher Ed
👉 Learn how to use the double angle identities to solve trigonometric equations. When we have equations with a double angle we will apply the identities to create an equation that can help solve by inverse operations or factoring. We...
Instructional Video3:15
Brian McLogan

Pre-Calculus - Determine the Double Angle of Sine When Given a Triangle and Restrictions

12th - Higher Ed
👉 Learn how to evaluate the double angle of sine. The value of the sine of double a given angle can be obtained given the value of the sine of the angle. The value of the sine of double a given angle is obtained using the formula sin(2u)...
Instructional Video3:28
Brian McLogan

How to determine the function and angle given an expression

12th - Higher Ed
👉 Learn all about sum and difference angle identities. In this video playlist, you will learn how to evaluate, solve, simplify and verify using sum and difference angle identities. We will evaluate using angles not found on the unit...
Instructional Video2:05
Brian McLogan

Pre-Calculus - Evaluating for the Double Angle of Sine with a Triangle

12th - Higher Ed
👉 Learn how to evaluate the double angle of sine. The value of the sine of double a given angle can be obtained given the value of the sine of the angle. The value of the sine of double a given angle is obtained using the formula sin(2u)...
Instructional Video1:34
Brian McLogan

How to determine the function and angle when given an expression

12th - Higher Ed
👉 Learn all about sum and difference angle identities. In this video playlist, you will learn how to evaluate, solve, simplify and verify using sum and difference angle identities. We will evaluate using angles not found on the unit...
Instructional Video54:53
Brian McLogan

Double and Half Angle Formulas | Analytic Trig | Pre-Calculus

12th - Higher Ed
In this video we will explore how to use the double angle to evaluate trigonometric expressions from triangles as well as angles in degrees and radians. We will then use double angle formulas to help verify trigonometric identities and...
Instructional Video6:03
Brian McLogan

Solve an equation using the double angle of sine

12th - Higher Ed
👉 Learn how to use the double angle identities to solve trigonometric equations. When we have equations with a double angle we will apply the identities to create an equation that can help solve by inverse operations or factoring. We...
Instructional Video4:35
Brian McLogan

Pre-Calculus - Solve an Equation Using the Double Angle Formula of Sine

12th - Higher Ed
👉 Learn how to use the double angle identities to solve trigonometric equations. When we have equations with a double angle we will apply the identities to create an equation that can help solve by inverse operations or factoring. We...
Instructional Video3:55
Brian McLogan

Half angle of sine given right triangle and constraint

12th - Higher Ed
👉 Learn how to evaluate the tangent of a half-angle. When given the value of the tangent of an angle, we can evaluate the tangent of half the angle using the tangent half-angle formula. When the value of any other trigonometric function...
Instructional Video2:48
Brian McLogan

Pre-Calculus - Learn How To Evaluate The Double Angle for Sine Given a Triangle

12th - Higher Ed
👉 Learn how to evaluate the double angle of sine. The value of the sine of double a given angle can be obtained given the value of the sine of the angle. The value of the sine of double a given angle is obtained using the formula sin(2u)...
Instructional Video1:25
Brian McLogan

Write and evaluate expression using sum and difference identities

12th - Higher Ed
👉 Learn how to write a given sum or difference of two angles formula expression as a single sum/difference of angles trigonometric function. To do this, we first identify the trigonometric function for which its sum/difference formula is...
Instructional Video
Khan Academy

Khan Academy: Trigonometry: Proof: Sin(a+b)=(cos A)(sin B) + (Sin A)(cos B)

9th - 10th Standards
Video demonstrating the proof for the formula for the sine of the sum of two angles. Includes link to additional practice problems. [9:48]