h ( x ) = ∫ 2 1 / x arctan ( t ) d t {\displaystyle h(x)=\int _{2}^{1/x}\arctan(t)dt}
d d x [ h ( x ) ] = d d x [ ∫ 2 1 / x arctan ( t ) d t ] {\displaystyle {\frac {d}{dx}}\left[h(x)\right]={\frac {d}{dx}}\left[\int _{2}^{1/x}\arctan(t)dt\right]}
![{\displaystyle {\frac {d}{dx}}\left[h(x)\right]={\frac {d}{dx}}\left[\int _{2}^{1/x}\arctan(t)dt\right]}](https://en.wikipedia.org/api/rest_v1/media/math/render/svg/ad98adb8724b3e043397dd5d476308d3c13ebe86)