$\int 5^{a x} d x=$ কত ?

$\frac{5^{a x}}{\ln 5}$

$\frac{5^{a x}}{\operatorname{aln} 5}$

$\frac{5^{\mathbf{a}^{x}}}{5 \ln \mathrm{a}}$

$\frac{\ln 5^{a x}}{5}$