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What is the frequency of d=9cos(pi/2 t)

What is the frequency of d=9cos(pi/2 t)
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What is the frequency of d=9cos(pi/2 t)

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User Owusu
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The period is equal to 2pi/n, where n is the coefficient of t. In this case pi/2. Therefore the period in this example is 4. Frequency is equal to 1/period. Hence the frequency for this problem is 1/4
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User Saboora
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