Graphing Cosine with Reflection and Change in Period

The video tutorial explains how to graph the function Y = -5 cos(πX/6). It covers determining the amplitude, which is the absolute value of the coefficient, and calculating the period using the formula 2π/B. The tutorial also discusses finding critical points by dividing the period by 4 and setting the start and end points of the function. Finally, it demonstrates graphing the cosine function, considering the reflection over the X-axis due to the negative sign in the function.

What does the negative amplitude indicate about the graph?

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Describe the reflection of the cosine graph as mentioned in the text.

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How does the cosine function behave at its critical points according to the text?

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