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DrunkEngineer
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Homework Statement
Determine whether or not each of the following signals is periodic if signal is periodic determine the fundamental period (note that these are discrete not continuous signals) Show your solutions
1. [tex]x(n) = \cos^3(\frac{\pi(n)}{8})[/tex]
2. [tex]x(n) = \cos(\frac{n}{2})\cos(\frac{\pi(n)}{4})[/tex]
Homework Equations
Related example:
x(n) = cos(2n)
f = w/(2pi) = 2/(2pi) = 1/pi ----> this is an irrational number hence it is not periodic
The Attempt at a Solution
do i need to do trigonometric identities ? I read in the book that the sum of two periodic signals is "periodic" and it does not mention "product" where the given equation above is the case
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