# Trig Review Part 3

Taught by YourMathGal
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Part of video series
Meets NCTM Standards:
Lesson Summary:

In this trigonometry lesson, the instructor reviews graphing y = cos(x/3) and y = 2sin(pi*x/3), as well as stating their respective periods and amplitudes. The lesson also includes solutions to a review for a trigonometry test. The period of y = cos(x/3) is found by dividing 2pi by the coefficient of x, while the amplitude is simply the absolute value of the coefficient. For y = 2sin(pi*x/3), the period is calculated by dividing the period of sine (2pi) by the coefficient of x, while the amplitude is the absolute value of 2. Overall, the lesson provides a comprehensive review of these important trigonometric concepts.

Lesson Description:

Graphing y = cos(x/3) and stating period. Graphing y = 2sin(pi*x/3) and stating amplitude and period. Solutions to a Review for a Trigonometry Test for a class. . See pdf on that site under Trig, special videos.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

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