Answer Posted / girish

Apply kvl to ce loop
Vcc=IcRc+Vo
when Ib increases, Ic=beta x Ib increases which increses
IcRc.
therefore Vo decreses to as Vcc is constant..
Thus when Ib is increasing(Positive half cycle) output
decreses(goes negative) and when Ib decreses output V0
increses..producing 180 phase shift between input and output

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