$\int \frac{4 x d x}{\left(2 x^{2}+3\right) \log \left(2 x^{2}+3\right)}=$ কত?

$\left(2 x^{2}+3\right) e^{2 x^{2}+3}+k$

$\log \left\{\log \left(2 x^{2}+3\right)\right\}+k$

$2 \log \left\{\log \left(2 x^{2}+3\right)\right\}+k$

$\log \left(2 x^{2}+3\right) \log (4 x)+k$