$\lim_{x\to\infty}\left(\frac{\log_{10}\left(\ln\left(x\right)\right)}{\log_{10}\left(\log_{10}\left(x\right)\right)}\right)$

$\left(2a+3\right)\left(4a-5\right)$

$6x^2\cdot3^3+18x$

$2\int_{\frac{\pi}{2}}^0\left(4\sin\left(x\right)\right)dx$

$24x^3+24x^2+18x+11\:\:6x+3$

$\int\frac{e^{2t}}{\sqrt{e^t+1}}\:dx$

$\left(18\right).\left(11.12\right)$