Ch 46: WEST Math: Trigonometric Identities

About This Chapter

Knowing your trigonometric identities inside and out is critical for your success on the WEST Math exam. Watch the video lessons in this chapter for an in-depth review of trigonometric identities.

WEST Math: Trigonometric Identities - Chapter Summary

In this series of lessons, we'll guide you through essential trigonometric identity-related topics, including sum and difference identities, half-angle identities and more. Before taking the exam, refresh and refine your knowledge of these additional topics:

  • Trigonometric equation identities
  • Alternate trigonometric identities
  • Double-angle identities
  • Pythagorean identities
  • Reciprocal identities

Let our world-class math experts help you prepare for any trigonometric identity question thrown your way. Our instructors create some of the most informative test-prep video lessons you'll find anywhere. They're filled with straightforward problem examples and easy-to-follow solutions. At the completion of each lesson, take a brief quiz to make sure you have the material down cold. And, if there are still lingering questions, just send our instructors a message!

Objectives of the WEST Math: Trigonometric Identities Chapter

Washington State educators who want to teach math are required to obtain a specific math endorsement, and you need to pass the WEST Math exam in order to qualify. You can register online for this exam throughout the calendar year, and there's a very good chance you'll sit for the test at a Pearson testing center near you.

The computer-based test consists of 150 multiple-choice questions that must be answered within four hours and 15 minutes. A calculator will be provided by your testing center, in addition to a sheet of helpful formulas. To pass, you'll need a score of 220 or higher. You'll get a score report directly following completion of the test.

The video lessons in this chapter focus specifically on trigonometric identity-related questions that are part of the Trigonometry and Calculus portion of the exam. This portion makes up 19% of all questions you'll see on the WEST Math test. To ensure you're ready for all those questions, work through this set of lessons and let our instructors guide you to success.

11 Lessons in Chapter 46: WEST Math: Trigonometric Identities
Test your knowledge with a 30-question chapter practice test
Trigonometric Identities: Definition & Uses

1. Trigonometric Identities: Definition & Uses

After watching this video lesson, you will understand what a trigonometric identity is. You will also know the different kinds of identities you will come across.

List of the Basic Trig Identities

2. List of the Basic Trig Identities

There are specific trig functions that have very special and very simple relationships with each other. Learn the main one and how you can use it to understand the others.

Alternate Forms of Trigonometric Identities

3. Alternate Forms of Trigonometric Identities

After watching this video lesson, you will know some of the alternate forms of the basic trigonometric identities. You will also learn how to use these alternate forms.

Pythagorean Identities: Uses & Applications

4. Pythagorean Identities: Uses & Applications

After watching this video lesson, you will be able to spot the Pythagorean identities when you see them. You will also learn how these identities can help you solve more complicated trig problems.

Reciprocal Identities: Uses & Applications

5. Reciprocal Identities: Uses & Applications

Trigonometry is full of identities, a set of which are called the reciprocal identities. Watch this video lesson to learn what they are and how you can use them to help you solve problems.

Double-Angle Identities: Uses & Applications

6. Double-Angle Identities: Uses & Applications

Watch this video lesson to learn how you can use the double-angle identities in trigonometry to help you prove and solve more complicated trigonometry problems.

Half-Angle Identities: Uses & Applications

7. Half-Angle Identities: Uses & Applications

After watching this video lesson, you will be able to use half-angle identities to help you simplify your trig problems and also to help you prove other trig statements.

Product-to-Sum Identities: Uses & Applications

8. Product-to-Sum Identities: Uses & Applications

After watching this video lesson, you will know what the four product-to-sum identities are. You will also know how they are used. You will also see two examples of problems.

Sum-to-Product Identities: Uses & Applications

9. Sum-to-Product Identities: Uses & Applications

In this video lesson, you will learn about the four sum-to-product identities for the sine and cosine functions. Learn how to go from the sum or subtraction of two functions to the product of two functions along with the two angles.

Verifying a Trigonometric Equation Identity

10. Verifying a Trigonometric Equation Identity

Watch this video lesson to learn how you can use your basic definitions and identities to help you prove a trigonometric equation identity. Learn what is involved and what to do for a successful answer.

Applying the Sum & Difference Identities

11. Applying the Sum & Difference Identities

Watch this video lesson to learn the six sum and difference identities for the trig functions of sine, cosine, and tangent. Also, learn how you can use them to your advantage when solving tough trig problems.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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