$\displaystyle \int dx \,=\, x+c$
$x$ is a variable and $dx$ is the element of integration. The integral of one with respect to $x$ is written mathematically in integral calculus in the following way.
$\displaystyle \int{1}dx$
It is simply written as follows.
$\displaystyle \int dx$
The indefinite integral of one with $dx$ is equal to the sum of the $x$ and constant of integration.
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