# What is 1/cosx

Substitute this into 1 — cos x :. Skip to content.

In mathematics, an "identity" is an equation which is always true, regardless of the specific value of a given variable. Need a custom math course? K12 College Test Prep. Logically, mathematical identities are tautologies; that is, they are expressions which restate the same expression in a different way. In other words, the identities allow you to restate a trig expression in a different format, but one which has the exact same value. There are loads of trigonometric identities, but the following are the ones you're most likely to see and use.

## What is 1/cosx

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If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Donate Log in Sign up Search for courses, skills, and videos. Using trigonometric identities. About About this video Transcript. Created by Sal Khan. Want to join the conversation? Log in. Sort by: Top Voted.

### What is 1/cosx

When it comes down to simplifying with these identities, we must use combinations of these identities to reduce a much more complex expression to its simplest form. Finally, on a last note, I know that here in Canada, British Columbia more specifically, these identities are given on a formula sheet, but I don't know what it's like elsewhere. In any event, many students, me included, memorize these identities because they're that important to mathematics. I would highly recommend memorization. Note that the graph of an even function is symmetric about the y -axis, and the graph of an odd function is symmetric about the origin. Key Questions How do you use the fundamental trigonometric identities to determine the simplified form of the expression? What are even and odd functions? How do you use the fundamental identities to prove other identities? Kevin B. How do you use the fundamental trigonometric identities to determine the simplified form of the expression?

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Terms of Use Privacy Contact. Hire With Us. How many miles are meters? Improve Improve. There are loads of trigonometric identities, but the following are the ones you're most likely to see and use. Please Login to comment What is the Meaning of 30kk? Logically, mathematical identities are tautologies; that is, they are expressions which restate the same expression in a different way. Get paid for your published articles and stand a chance to win tablet, smartwatch and exclusive GfG goodies! Similar Reads. The following particularly the first of the three below are called "Pythagorean" identities. What is 2km in miles? Need a custom math course?

In trigonometry , trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.

Article Tags :. Like Article. Notice in particular that sine and tangent are odd functions , being symmetric about the origin, while cosine is an even function , being symmetric about the y -axis. What is the Fraction of 4? Engineering Exam Experiences. Related Articles. Save Article. Improve Improve. Save Article Save. In other words, the identities allow you to restate a trig expression in a different format, but one which has the exact same value. How many miles are meters? Vote for difficulty :.

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