Find the interval on which the curve y = [tex]\int_0^{x}[/tex](1/(1 + t + t(adsbygoogle = window.adsbygoogle || []).push({}); ^{2}))dt

is concave upward.

I know that I need to find the derivative of the integral.

But I can't figure out how.

I tried to use substitution, letting u = (1 + t + t^{2}).

Then du = (1 + 2t)dt. But that doesn't work.

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# Homework Help: Find the derivative of the integral

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