Hello...I need help and I know this is a very simple problem...I don't know why I'm getting stuck( Maybe because it's past midnight here )(adsbygoogle = window.adsbygoogle || []).push({});

Assume that f is non-negative on (0,1) and the third derivative of f exists on (0,1).If f(x)=0 for at least 2 values of x in (0,1), show that there exists "c" in (0,1) such that the third derivative of f at c is 0.

this is what i've done...let a,b be the points where f vanishes. that is f(a)=f(b)=0

so we can use Rolle's theorem and get a point p such that f^(p)=0.

What next??

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# Assume that f is non-negative on (0,1)

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