Pre-Calculus For Dummies by Mary Jane Sterling

Author:Mary Jane Sterling [Sterling, Mary Jane]
Language: eng
Format: epub, pdf
ISBN: 9781119508717
Publisher: Wiley
Published: 2018-11-06T00:00:00+00:00

Seeing how the periodicity identities work to simplify equations

Similar to the co-function identities, you use the periodicity identities when you or inside a trig function. Because adding (or subtracting) radians from an angle gives you a new angle in the same position, you can use that idea to form an identity. For tangent and cotangent only, adding or subtracting radians from the angle gives you the same result, because the period of the tangent and cotangent functions is .

For example, to simplify , follow these steps:

Replace all trig functions with the appropriate periodicity identity.

You get .

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