The function \( f(x)=1+[\cos x] x \), in \( 0x \leq \frac{\pi}{2} \) (a) has a minimum value 0 (...

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The function \( f(x)=1+[\cos x] x \), in \( 0x \leq \frac{\pi}{2} \)
(a) has a minimum value 0
(b) has a maximum value 2
(c) is continuous in \( \left[0, \frac{\pi}{2}\right] \)
(d) is not differentiable at \( x=\frac{\pi}{2} \)
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