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Friction force acting on an object is given as
P function of angle ' \( \theta \) ' \( f_{r}=\frac{\mu m g}{\sin \theta+\mu \cos \theta} \) then find the value of \( \theta \) for which \( f_{r} \) will be minimum
(1) \( \mu \mathrm{mg} \)
(b) \( \frac{\mu m g}{1+\mu} \)
(3) \( \frac{\mu m g}{\sqrt{1+\mu^{2}}} \)
(4) Zero
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