Then the equation is deformed by 2-| x | = √ (a 2-x 2).

On the left is the image of the piecewise function? As shown in the figure:? Two straight lines passing through (2,0)

Another x 2+y 2 = a 2? The upper part of the courtyard.

Distance from origin to straight line y=2+x = √ 2

Greater than 2? There is no intersection point in the straight line.

Answer choice: b