What is the frequency of the sinusoidal graph?

A sinusoidal function is a periodic function because the basic shape repeats indefinitely in both the positive and negative directions. The frequency of a sine wave is defined as the number of cycles it completes in a given interval and is the reciprocal of the period. In a mathematical language this is written as:

To get the period, just subtract the x-coordinates of two consecutive peaks, so:

Therefore, the frequency is:

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30,40,50 is correct answer