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If f(x)=ax^3+bx^2+cx+d, where a, b, c, d...

If `f(x)=ax^3+bx^2+cx+d,` where a, b, c, d are real numbers and `3b^2 < c^2,` is an increasing cubic function and `g(x)=af prime(x)+bf prime prime(x)+c^2,` then

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