Never fall behind in trigonometry class again! Our short, 5-minute video lessons detail tough trigonometry concepts in a way that's simple for you to understand. Transcripts as well as captions are available for your convenience. Each lesson is capped by a quiz to make sure you've got the trigonometry figured out.

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What is Trigonometry? - Functions, Formulas & Applications

34K

Trigonometry: Sine and Cosine

51K

Pythagorean Identities in Trigonometry: Definition &...

31K

Measuring the Angles of Triangles: 180 Degrees

29K

Triangle Lesson for Kids: Definition & Facts

32K

Using Sine to Find the Area of a Triangle

5.4K

Angles and Triangles: Practice Problems

32K

What is a Scalene Triangle? - Definition, Properties &...

144K

Triangles: Definition and Properties

39K

Graphing Tangent from the Unit Circle

20K

Shapes with Right Angles

27K

How to Find the Height of a Triangle

19K

Included Angle of a Triangle: Definition & Overview

37K

Types of Triangles & Their Properties

101K

Practice Identifying Triangles

2.1K

What is an Acute Angle? - Definition, Description & Examples

116K

Solving Oblique Triangles Using the Law of Cosines

7.6K

Reflex Angle: Definition & Examples

101K

Using the Law of Sines to Solve a Triangle

6K

Circle Definition: Lesson for Kids

39K

Understanding Trigonometric Substitution

7.9K

Other Trigonometric Functions: Cotangent, Secant & Cosecant

9K

How to Find the Equation of a Circle

22K

Identifying Straight Angles

2.6K

What is a Straight Angle? - Definition & Example

38K

Supplementary Angle: Definition & Theorem

69K

Finding the Sinusoidal Function

4.7K

Practice Problems with Circular Trigonometric Functions

12K

Pythagorean Identities: Uses & Applications

4.2K

Types of Angles: Vertical, Corresponding, Alternate...

374K

The HA (Hypotenuse Angle) Theorem: Proof, Explanation, &...

59K

Circular Functions: Equations & Examples

23K

Sum-to-Product Identities: Uses & Applications

3.1K

Solving a Trigonometric Equation Graphically

7.2K

Solving Real World Problems Using the Law of Cosines

27K

How to Graph cos(x)

23K

Working with Adjacent Angles

6.3K

How to Find the Period of Sine Functions

28K

Angle Pairs: Types & Concept

31K

Double-Angle Identities: Uses & Applications

6.4K

How to Find the Period of Cosine Functions

58K

Cotangent: Definition & Formula

18K

Arctan: Definition, Function & Formula

27K

Trigonometric Function Values of Special Angles

26K

Using Graphs to Determine Trigonometric Identity

6.6K

Coterminal Angles: Definition & Examples

27K

Trigonometric Identities: Definition & Uses

14K

Practice Finding the Trigonometric Ratios

17K

Linear Pair: Definition, Theorem & Example

166K

How to Use Trigonometric Substitution to Solve Integrals

5.8K

How to Graph Trigonometric Functions

28K

Proving Angle Relationships

5.4K

Reciprocal Identities: Uses & Applications

6.9K

Properties of Inverse Trigonometric Functions

9.2K

How to Calculate Derivatives of Inverse Trigonometric...

10K

Verifying a Trigonometric Equation Identity

3.8K

Slopes of Tangent & Secant Lines

1.9K

Half-Angle Identities: Uses & Applications

2.7K

Graphing the Cosecant, Secant & Cotangent Functions

8K

Proving the Addition & Subtraction Formulas for Sine,...

12K