Answer
$1$
Work Step by Step
We know that $\int x^{n} dx=\dfrac{x^{n+1}}{n+1}+C$
where $C$ is a constant of proportionality.
Now, $\int_1^2(x-\dfrac{1}{x^2}) dx=[\dfrac{x^{1+1}}{1+1}-\dfrac{x^{-2+1}}{-2+1}]_1^2$
or, $[\dfrac{x^2}{2}+\dfrac{1}{x}]_1^2=2+1/2-1/2-1=1$
