If X(F) = 3[?1(F ? 1/4) + ?1(F + 1/4) ] ? j4 [ ?1(F + 1/9) ? ?(F ? 1/9) ] and 
what is the fundamental period of x[n] ?
What will be an ideal response?
The fundamental period of x [n] is the least common multiple of the fundamental periods of the sine and cosine which are added to form it. The least common multiple of 4 and 9 is 36.
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