What is the frequency of the sinusoidal graph?

The frequency is defined as

where is the period, i.e. the time between two maximum/minimum points.

In your example, you can see that a maximum is reached when , and the next one at . This means that the period is

So, the frequency is

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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