Model Periodicity, Amplitude, Frequency, and Midline of Trigonometric Functions: CCSS.Math.Content.HSF-TF.B.5 - Common Core: High School - Functions

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What is the period of the following function?

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This question is testing one's ability to identify the periodicity of a trigonometric function. This requires the understanding of trigonometric functions and their graphical and algebraic characteristics.

For the purpose of Common Core Standards, "Choose trigonometric functions to model periodic phenomena with specified amplitude, frequency, and midline" falls within the Cluster B of "Model Periodic Phenomena with Trigonometric Functions" concept (CCSS.MATH.CONTENT.HSF-TF.B.5).

Knowing the standard and the concept for which it relates to, we can now do the step-by-step process to solve the problem in question.

Step 1: Write the general form of trigonometric shifts.

where

Step 2: Algebraically identify the period.

Given the function

identify the variables of the general form.

Step 3: Graph the trigonometric function to verify.

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The graph above verifies that the period of this function is because the flow of the graph only begins to repeat its cycle after units on the - axis.