Which of the given signals are periodic?
A. x(t) = 4 cos(5πt)
B. x(t) = u(t) – 1/2
C. x(t) = 4u(t) + 2sin(3t)
D. x[n] = 2sin(3n)
Answer:A
Which of the given signals are periodic?
A. x(t) = 4 cos(5πt) B. x(t) = u(t) – 1/2 C. x(t) = 4u(t) + 2sin(3t) D. x[n] = 2sin(3n)
Explanation:	T=2π / 5π = 2/5 , periodic with period 2/5.