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Determine the transmission coefficient for a rectangular barrier
(same as Equation 2.127, only with +Vo in the region -a < x <a). Treat separately
the three cases E< Vo. E = Vo, and E> Vo (note that the wave function inside the
barrier is different in the three cases). Partial answer: For E<V0,28
T¹=1+
V²
4E(V₁ - E)
; sinh ( V2m(Vo – E)

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