$\lim_{x\to0}\left(\frac{sin^2\left(2x\right)}{x}\right)$

$\int\left(\frac{1}{\left(x^2+6x+5\right)}\right)dx$

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

$81m^{4}-144n^{6}$

$\sqrt{x\left(x+2\right)}$

$\left(-2\right)^2+3\left(-2\right)$

$\int\ln\left(x+\frac{1}{2}\right)dx$