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Q.

Which of the following function(s) is/are periodic?

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a

g(x)=sgn{x}  where {x} denotes the fractional part function

b

ff(x)=2x2[x] where [ ] denotes greatest integer function

c

h(x)=Sin1cosx2

d

k(x)=Cos1(sinx)

answer is A, B, D.

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Detailed Solution

a) period of x–[x] is 1.
b) period of {x} is 1.
c) period does not exist.
d) period is 2π .

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