1. Consider the Sturm-Liouville equation dz (p(x)du) — q(x)u + \p(x)u = 0 dx on a < x 0 and q > 0 for a < x satisfies sin λ = p(t) p(t) n²π² p(t) (Sa √ de with n an integer. Ideally, you use the WKB ansatz. 2' dt 7

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