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Differentiate w.r.t. a
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\int \frac{a}{x}\mathrm{d}x
Evaluate the indefinite integral first.
a\int \frac{1}{x}\mathrm{d}x
Factor out the constant using \int af\left(x\right)\mathrm{d}x=a\int f\left(x\right)\mathrm{d}x.
a\ln(|x|)
Use \int \frac{1}{x}\mathrm{d}x=\ln(|x|) from the table of common integrals to obtain the result.
a\ln(|2|)-a\ln(|1|)
The definite integral is the antiderivative of the expression evaluated at the upper limit of integration minus the antiderivative evaluated at the lower limit of integration.
a\ln(2)
Simplify.