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**password** Hey I keen to know that you people replied me but right now I'm passing with a very huge problem and that is I am engineering student and pursuing my engineering in the electronics ,I have a subject Mathematics as well as a signal system also ,now signal and system also contents some problems regarding the fourier transforms and laplace transform so can any one tell me that why we use that topics in the field of the mathematics as well as in the signal and system ....

one problem regarding to the Laplace transforms also that what is a "ROC" ,can any one explain me ,