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Subject Quantum Mechanics. Wave function normalization and superposition of solutions.

Wavel functions, ψ₁ and ψ₂ both normalized.

Find a relationship between A and B such that the superposition Aψ₁ + Bψ₂ is also a normalized solution.

I'm having trouble with the integral of |Aψ₁ + Bψ₂|² dx.

Thank you!

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