$\lim_{x\to\infty}\left(\frac{2x^2-3x+4}{\sqrt{x^4+1}}\right)$

$\cot\left(2x\right)=\frac{1-\tan^2\left(x\right)}{2tanx}$

$\int\left(\frac{e^{15x}}{\left(e^{15x}+9\right)^5}\right)dx$

$3\ge4x+2$

$\left|-21\right|\left(\left|-22\right|\right)$

$13.40-50$

$\int\left(\frac{\left(1+\sqrt{x}\right)^3}{\sqrt{x^3}}\right)dx$