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If the equation of the normal to the cur...

If the equation of the normal to the curve `y=f(x) at x=0` is `3x-y+3=0` then the value of
`underset(xrarr0)(lim)(x^(2))/({f(x^(2))-5f(4x^(2))+4f(7x^(2))})` is

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