$\left(\frac{1}{9}m+\frac{2}{7}n\right)\left(\frac{1}{9}m+\frac{1}{3}n\right)$

$\lim_{x\to\infty}\left(e\right)\ln\left(x\right)$

$x^2+2xy+y;\:x=0;\:y=1$

$\left(\frac{y}{4}\right)^4$

$4b+8+4b+8$

$\int\left(x+20\right)\sqrt{40+x^2}dx$

$4x\left(1-x^2\right)+2\left(1+x^2\right)^2$