$4z+3z+9z$

$\int\frac{23}{xln4x}dx$

$\frac{1+\cos\left(x\right)}{\cos^2\left(x\right)}=\frac{25}{8}$

$\lim_{x\to100}\left(\frac{1}{25}x^2\:-\:\sqrt{x}\right)$

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

$\left(xy^2\right)\left(x+\frac{5}{4}\right)$

$\left(\frac{1}{2}\:a^{m-2}-\frac{3}{4}m^{3m+2}\right)^2$