Autonomous ODE, determine initial value given limit[x->infty] y(x) = 15/2

Julian

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Hello, I attached a picture of my question. I am having a lot of trouble getting the answer.



Consider the following initial-value problem.

. . .\(\displaystyle \dfrac{dy}{dx}\, =\, \left(y^2\, -\, 9y\, +\, 8\right)\,\sin^2\left(\dfrac{2\pi y}{15}\right),\qquad y(0)\, =\, a\)

Give a possible value for the real number a for which the solution to the corresponding initial-value problem is a non-constant function that satisfied the following:

. . .\(\displaystyle \displaystyle \lim_{x \rightarrow \infty}\, y(x)\, =\, \dfrac{15}{2}\)



I thought that a would simply be 15/2 because of Picard's theorem but this is incorrect and I do not understand why.
 
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If a= 15/2, then the constant solution y= 15/2 would satisfy the equation and the initial value. This problem specifically asks for a value of a that gives a non-constant solution.
 
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