Which of the following function is periodic with fundamental period \( \pi \) ? (a) \( f(x)=\cos...

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Which of the following function is periodic with fundamental period \( \pi \) ?
(a) \( f(x)=\cos x+\left[\mid \frac{\sin x}{2} \|\right. \); where [.] denotes greatest integer function
(b) \( g(x)=\frac{\sin x+\sin 7 x}{\cos x+\cos 7 x}+|\sin x| \)
(c) \( h(x)=\{x\}+|\cos x| \); where \( \{\cdot\} \) denotes fractional part function
(d) \( \phi(x)=|\cos x|+\ln (\sin x) \)
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