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The Liénard system  is considered. Under some assumptions on functions  and  we estimate the domain of location of the unique stable limit cycle of the Liénard system. This estimation has the form  where  and  are respectively, the positive and the negative roots of the equation  We use the above result for evaluating the amplitude of the limit cycle of the van der Pol equation 

nonsymmetric Liénard system, location of a limit cycle.