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The sum of squares of the length of the perpendiculars drawn from the points (0,1) and (0,−1) to any tangent to a curve y=f(x) is 2 units. Then the number of roots of f(x)=0 is

Answer» The sum of squares of the length of the perpendiculars drawn from the points (0,1) and (0,1) to any tangent to a curve y=f(x) is 2 units. Then the number of roots of f(x)=0 is


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