Find the fundamental periods (if they exist) of
(a) x [n] = ?14 [n] ? 6 ?8 [n]
(b) x [n] = ?2 cos (3?n/12) + 11 cos (14?n/10)
(c) x [n] = cos (n/3)
(d) x [n] = cos (7?n/3) ? 4 sin (11?n/5)
(e) x [n] = 9 cos (7?n/15) + 14 sin (8?n/11)
(f) x [n] = 22 sin (13n/12) ? 13 cos (18n/23)
Solution:
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