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Abstract In this thesis, we discuss the oscillatory behavior of solutions of the second order nonlinear damped differential equations of the form ( ( ) ( ( )) ( )) ( ) ( ) ( ) ( ( ( ))) and the oscillatory behavior of the second order nonlinear neutral delay differential equation ( ( ) ( ( ))| ( )| ( )) ( ( ( ))) where ( ) ( ) ( ) ( ( )) and is the ratio of two odd integers. The obtained results improve and extend some known results in the literature. We give some examples that justisfy our results. |