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. Notice how a "co- something " trig ratio is always the reciprocal of some "non-co" ratio.

What is 1/cosx

.

Note that the three identities above all involve squaring and the number 1. What is.

.

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.

What is 1/cosx

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.

Dental assistant wage

Improve Improve. You will be using all of these identities, or nearly so, for proving other trig identities and for solving trig equations. Terms of Use Privacy Contact. Theorem - Angle opposite to equal sides of an isosceles triangle are equal Class 9 Maths. Please go through our recently updated Improvement Guidelines before submitting any improvements. How to divide a Line Segment into four equal parts? Additional Information. How Much is 1, Seconds in Minutes? Hire With Us. Last Updated : 06 Feb, You will be notified via email once the article is available for improvement.

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.

How Many Litres is 1 kg? Participate in Three 90 Challenge! Admission Experiences. Substitute this into 1 — cos x :. Visit Our Profiles. Vote for difficulty :. Like Article. Hire With Us. If the perimeter and area of a square are equal, calculate the side of the square. By the way, in the above identities, the angles are denoted by Greek letters. All right reserved. How to divide a Line Segment into four equal parts?