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If a tangent to the ellipse x2a2+y2b2=1 having slope 2 is normal to the circle x2+y2+4x+1=0, then the maximum value of ab is

Answer» If a tangent to the ellipse x2a2+y2b2=1 having slope 2 is normal to the circle x2+y2+4x+1=0, then the maximum value of ab is


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