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If two different tangents of y^2=4x are ...

If two different tangents of `y^2=4x` are the normals to `x^2=4b y ,` then (a)`|b|>1/(2sqrt(2))` (b) `|b|<1/(2sqrt(2))` (c)`|b|>1/(sqrt(2))` (d) `|b|<1/(sqrt(2))`

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