Determine the period of the cosine function

The video tutorial explains the cosine function equation, starting with the general form Y = a cos(BX - C) + D. It breaks down the components of the equation, focusing on rewriting it in a simpler form. The tutorial then demonstrates how to calculate the period of the cosine function by dividing 2π by B. The lesson concludes with the final answer, ensuring students understand the process and the result.

Discuss the relationship between the coefficients in the cosine function and the graph's characteristics.

What is the significance of multiplying by the reciprocal when finding the period?