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# Free Trigonometry Help

## Text Lessons

❶Card number is required. In this video, Dr.

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The sides are almost the same. There are no powers greater than 2, so we can skip this step. Since cos 2 x - sin 2 x appears on both sides of the equation, we can cancel it.

We are left with: Since this is one of the pythagorean identities, we know it is true, and the problem is done. The 7 step method works both sides and meets in the middle, like a V. Some teachers will ask you to prove the identity directly from one side to the other in a straight line. That is easily done using the work above. Just write down all the left side parts in order first, then the right side parts in backwards order, so it looks like this:. Or write the right hand steps in order first and then the left hand step backwards so it looks like this:.

Even though this is a simple problem, the same steps will work every time no matter the difficulty. Essential Identities The trick to proving trig identities is intuition, which can only be gained through experience. There are no powers greater than 2, so we can skip this step STEP 6: Proving Identities Directly The 7 step method works both sides and meets in the middle, like a V. Just write down all the left side parts in order first, then the right side parts in backwards order, so it looks like this: Extra Tips Get both sides of the equation in the same functions.

The same goes for addition and subtraction: Once you get the hang of it, you will begin to see patterns. For instance, in the example above, you might notice right off that the left side is difference of two squares and do that first. If you keep getting stuck on a problem, take a break. Come back with a clean sheet of paper, and start over from the beginning. Often, it helps to change the direction from left-right to right-left.

Let someone else read through your work, just to see if they follow it and can give a new perspective. Trig Help Everything you need to know to get through your trig class. 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. 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. 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. 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. 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.

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. 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. 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. 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. 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. Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.

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Find a degree that fits your goals. Try it risk-free for 30 days. About This Chapter The Working with Trigonometric Identities chapter of this Trigonometry Homework Help course helps students complete their homework in trigonometric identities, and earn better grades. This homework help resource uses simple and fun videos that are about five minutes long. Working with Trigonometric Identities: Test your knowledge with a question chapter practice test.

View all practice tests in this course. List of the Basic Trig Identities There are specific trig functions that have very special and very simple relationships with each other. Alternate Forms of Trigonometric Identities After watching this video lesson, you will know some of the alternate forms of the basic trigonometric identities.

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. Test your knowledge of this chapter with a 30 question practice chapter exam. Other Practice Exams in this course. Test your knowledge of the entire course with a 50 question practice final exam. Earning College Credit Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.

To learn more, visit our Earning Credit Page Transferring credit to the school of your choice Not sure what college you want to attend yet? Browse Articles By Category Browse an area of study or degree level. Are High Schools Failing Students? High School Diploma Through the Mail. How to Become a Consumer Psychologist: Homework Help Working with Inequalities in Trigonometry: Homework Help Mathematical Modeling in Trigonometry: Homework Help Introduction to Quadratics in Trigonometry: Homework Help Coordinate Geometry Review: Homework Help Functions for Trigonometry:

## Main Topics

The Trigonometric Identities chapter of this High School Precalculus Homework Help course helps students complete their trigonometric identities.

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