Calculating time period of cos(pi/8 n*n)

[tina_singh]

can some one please help me calculate the time period of the signal cos(pi/8 n*n).

 

[tina_singh]

actually what really confuses me is the term n square..i have solved similar questions where cos was a function of n(t in continuous time).

please help me with this question..
i will be really greatful

 

[Saitama]

actually what really confuses me is the term n square..i have solved similar questions where cos was a function of n(t in continuous time).

please help me with this question..
i will be really greatful

It seems like that this function is not periodic. Enter this in wolfram alpha, check out the graph.

 

[rude man]

actually what really confuses me is the term n square..i have solved similar questions where cos was a function of n(t in continuous time).

please help me with this question..
i will be really greatful

Write out the first dozen or so terms, then the periodicity will become apparent.