Girl: How’s the exam preparation going?
Guy: It is like a sine wave. Studying for sometime, quorifying for sometime and thinking of you, most of the time. The cycle goes on like that. Time period 24 hours.How about you ?
Girl: My preparation is like an exponential curve.While I study, my productivity increases exponentially like, e power x graph. But, the moment I think of you, my concentration decreases like e power -x graph.