The equation of a curve is Ax2+By2+Cy=8Ax^{2}+By^{2}+Cy=8, where AA, BB and CC are constants. The curve has a tangent parallel to the y-axis at the point (2,1). Given that dydx=32\dfrac{dy}{dx}=\dfrac{\sqrt{3}}{2} and d2ydx2=94\dfrac{d^{2}y}{dx^{2}}=\dfrac{9}{4} at the point where the curve cuts the positive x-axis, find the values of AA, BB and CC.

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