The Heaviside function, also known as the step function, is defined as: u(t) = {1 for t = 0, 0 for t

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The Heaviside function, also known as the step function, is defined as: u(t) = {1 for t >= 0, 0 for t < 0} We can use this function to express the given function f(t) in terms of Heaviside functions. The given function f(t) is defined as 4cos(9t) for 7 ≤ t < 8 and 0 otherwise. We can express this using Heaviside functions as follows: f(t) = 4cos(9t) * [u(t - 7) - u(t - 8)] Here, u(t - 7) is 1 for t >= 7 and 0 for t < 7, and u(t - 8) is 1 for t >= 8 and 0 for t < 8. So, the term [u(t - 7) - u(t - 8)] is 1 for 7 ≤ t < 8 and 0 otherwise, which matches the condition for f(t) to be 4cos(9t). Therefore, f(t) = 4cos(9t) * [u(t - 7) - u(t - 8)] is the expression of the given function using Heaviside functions.

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The Heaviside function, also known as the step function, is defined as: u(t) = {1 for t >= 0, 0 for t < 0} We can use this function to express the given function f(t) in terms of Heaviside functions. The given function f(t) is defined as 4cos(9t) for 7 ≤ t < 8 and 0 otherwise. We can express this using Heaviside functions as follows: f(t) = 4cos(9t) * [u(t - 7) - u(t - 8)] Here, u(t - 7) is 1 for t >= 7 and 0 for t < 7, and u(t - 8) is 1 for t >= 8 and 0 for t < 8. So, the term [u(t - 7) - u(t - 8)] is 1 for 7 ≤ t < 8 and 0 otherwise, which matches the condition for f(t) to be 4cos(9t). Therefore, f(t) = 4cos(9t) * [u(t - 7) - u(t - 8)] is the expression of the given function using Heaviside functions.

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