(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Determine whether x[n] is periodic, if so find the fundamental period.

ps forgive my notation, i'm new to physics forums and haven't had a chance to figure out the exact notation syntax yet.

x[n]=cos(π/6 * n^2)

3. The attempt at a solution

x(n) is periodic when x(n) = x(n +N)

x(n+N) = cos(π/6 * (n+N)^2)

π/6(2*n*N + N^2) = k*2*π

this is kinda where i got stuck

(2*n*N + N^2) = 12 * k

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# Difficult discrete-time periodicity problem

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