1.

Which of the following functions is periodic ?

Answer»

`F(x)=x-[x]`, where [x] DENOTES the largest integer LESS than or equal to the real number x
`f(x)=sin"" 1/2` for `x != 0, f(0)=0`
`f(x)=x COS x`
`f(x)= (tan x)/(x)`

Answer :A


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