Trigonometry: Getting Started - Trigonometric identities
This is a free lesson from our course in Trigonometry
This lesson introduces and walks you through the Trigonometric Identities. You'll learn it with the help of some examples, practice questions with solution, and watching video as well as explanations by the instructor in their hand writing. The trigonometric identities are equalities that involve trigonometric functions that are true for every single value of the occurring variables.Here you'll learn how these identities are useful when expressions involving trigonometric functions need to be simplified and put into application. (More text below video...)
<h2>Trigonometry - Getting started - Trigonometric identities</h2> <p>trigonometric identities, basic, trigonometric functions, video, Pythagorean Identities, sine, cosine, tangent, explanation, example, cotangent, secant, cosecant, trigonometry, value, variables, solution, identities, practice questions, quizzes, Pythagorean</p> <p>The trigonometric identities are equalities that involve trigonometric functions that are true for every single value of the occurring variables</p>
Other useful lessons:
Pythagorean Trigonometric Identity
Verifying Trigonometric Identities
(Continued from above) Some of the important trigonometric identities are:
Reciprocal Identities:
      csc  = 1/sin                sin  = 1/csc 
      sec = 1/cos               cos = 1/sec 
      tan = 1/cot               cot = 1/tan

Tangent and Cotangent Identities:
      tan  =  sin /cos
      cot  =  cos /sin

Pythagorean Identities:
       sin2  + cos2  = 1 
       tan2  + 1 = sec2
       1 + cot2  = csc2

Even/Odd Identities
        sin (- ) = - sin 
        cos(- ) = cos 
        tan (- ) = - tan

Sum and Difference Identities
        Sin(A-B) = sin A cos B cos A sin B
        Cos(A-B)= cos A cos B + sin A Sin B

Double Angle Identities
        Sin2 = 2 sin cos
        cos 2 = cos2 sin2 = 2cos2 -1=1- 2 sin2
        tan2 = 2tan/1-tan2
Winpossible's online math courses and tutorials have gained rapidly popularity since their launch in 2008. Over 100,000 students have benefited from Winpossible's courses... these courses in conjunction with free unlimited homework help serve as a very effective math-tutor for our students.
- All of the Winpossible math tutorials have been designed by top-notch instructors and offer a comprehensive and rigorous math review of that topic.
- We guarantee that any student who studies with Winpossible, will get a firm grasp of the associated problem-solving techniques. Each course has our instructors providing step-by-step solutions to a wide variety of problems, completely demystifying the problem-solving process!
- Winpossible courses have been used by students for help with homework and by homeschoolers.
- Several teachers use Winpossible courses at schools as a supplement for in-class instruction. They also use our course structure to develop course worksheets.
 Copyright © Winpossible, 2010 - 2011
Best viewed in 1024x768 & IE 5.0 or later version