Consider the function y is equal to cosine of x Which change would increase the period by a factor of 3 ?

The period of y = cos(x) is 2π. Replacing x with x/3 gives y = cos(x/3), whose period is 6π: the input must increase by 6π for x/3 to increase by 2π. Thus, multiplying x by 1/3 increases the period by a factor of 3. Multiplying the cosine output changes the graph’s height, not its period.

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