$\left(a\cdot\frac{3}{5}\text{b}\right)\left(\frac{1}{3}a^2+\frac{3}{10}a+\frac{9}{25}\left(b^2\right)\right)$

$\int_{-1}^3\left(3x^2+1\right)dx$

$\int5\sqrt{5+4x-x^2}dx$

$\lim_{x\to\infty}\left(\frac{x^2+2x+2}{5x^3+x^2}\right)$

$43\cdot10^7$

$\frac{x}{3}-21=12$

$\left(\frac{10}{7}x^5y^2+\frac{1}{5}x^3y^4\right)^2$