A few days in the past one in all our colleagues requested us are compatible the knowledge from a harmonic sign with a cheap wisdom of its habits. This turns out a regular downside as in physics many processes are periodic. The piston of a motor; the pendulum of an eye; the movement of a wheel; even the motion of the moon across the Earth observe a development that may be modeled as what in physics is named a harmonic oscillator, which mathematically may also be expressed as:


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