Answer
$x-\dfrac{x^3}{3}-\dfrac{x^6}{2}+C$
Work Step by Step
Since, we have $\int (1-x^2-3x^5) dx=x-\dfrac{x^3}{3}-\dfrac{x^6}{2}+C$
and
$\dfrac{d}{dx}(x-\dfrac{x^3}{3}-\dfrac{x^6}{2}+C)=1-x^2-3x^5$
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