F(x) = Sqrt(a^2 - X^2) What Does This Graph Look Like?

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Oddman answered
This is a rearrangement of the equation
x^2 + (F(x))^2 = a^2
which is the equation for a circle of radius a centered at the origin. If only the positive root is taken, then you get only the upper half of the circle.

The picture is a plot for a=1.

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