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Find the intervals of the values of a fo...

Find the intervals of the values of `a` for which the line `y+x=0` bisects two chords drawn from the point `((1+sqrt(2)a)/2,(1-sqrt(2)a)/2)` to the circle `2x^2+2y^2-(1+sqrt(2)a)x-(1-sqrt(2)a)y=0`

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