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Tangent to the parabola y=x^(2)+ax+1 at ...

Tangent to the parabola `y=x^(2)+ax+1` at the point of intersection of the y-axis also touches the circle `x^(2)+y^(2)=r^(2)`. Also, no point of the parabola is below the x-axis.
The slope of the tangents when the radius of the circle is maximum is

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