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    • https://phys.libretexts.org/Bookshelves/Quantum_Mechanics/Quantum_Mechanics_(Walet)/06%3A_Scattering_from_Potential_Steps_and_Square_Barriers/6.03%3A_Square_Barrier
      \[ \begin{align} A_1 e^{−ika} + B_1 e^{ika} + A_3 e^{ika} &= 2 A_2 \cosh κ a \label{6.22} \\[5pt] i k ( − A_1 e^{−ika} + B_1 e^{ika} + A_3 e^{ika} ) &= 2 κ A_2 \sinh κ a \label{6.23} \\[5pt] A_1 e^{−i...A1eika+B1eika+A3eika=2A2coshκaik(A1eika+B1eika+A3eika)=2κA2sinhκaA1eika+B1eikaA3eika=2B2sinhκaik(A1eikaB1eika+A3eika)=2κB2coshκa

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