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If the curves x2−6x+y2+8=0 and x2−8y+y2+16−k=0,(k>0) touch each other at a point, then the largest value of k is

Answer» If the curves x26x+y2+8=0 and x28y+y2+16k=0,(k>0) touch each other at a point, then the largest value of k is


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