$4^2.3^2$

$\lim_{x\to-\infty}\left(\frac{2e^x}{1+e^x}\right)$

$\int\ln\frac{x}{\sqrt{2x-5}}dx$

$\lim_{x\to-3}\left(\frac{x^2}{\left(x+3\right)^3}\right)$

$\sqrt[7]{\frac{\left(x^2+6\right)}{\left(x^2+7\right)}}$

$a^2-2a-35=0$

$\int\left(\left(2x-5\right)\left(x^2-5x\right)\right)dx$