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In order to show how stringent the restrictions posed on analytical solutionsof quasi-exactly solvable potentials are, we construct analytical solutions forthe Razavy type potential V(x) = Vo (sinh**4(x)-k sinh**2(x) ) based on thepolynomial solutions of the related Confluent Heun Equation, where the freeparameter k allows to tune energy eigenvalues, a desirable feature in differenttheories. However, we show that with the described method, the energyeigenvalues found diverge when k (goes to) -1, a feature caused solely by theprocedure.

On the analytical solutions of the quasi-exactly solvable Razavy type potential V(x) = Vo (sinh**4(x)-k sinh**2(x) )

On the analytical solutions of the quasi-exactly solvable Razavy type potential V(x) = Vo (sinh4(x)-k sinh2(x) )