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We report some results indicating changes in the observed dynamics of the R(o)ssler model under the influence of exteal sinusoidal forcing.By varying the control parameters of the exteal sinusoidal forcing,namely the amplitude and the angular frequency,we show,through numerical simulations which include parameter planes and Lyapunov exponents,that the exteal forcing can produce both chaos-order and order-chaos transitions.We also show that the sinusoidal forcing may generate hyperchaos.