Which of the following function is non periodic?....

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Which of the following function is non periodic?
\( \mathrm{P} \)
(1) \( f(x)=\{x\} \), the fractional part of the number \( x \)
W
(2) \( f(x)=\cot (x+7) \)
(3) \( f(x)=1-\frac{\sin ^{2} x}{1+\cot x}-\frac{\cos ^{2} x}{1+\tan x} \)
(4) \( f(x)=x+\sin x \)


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