$x^4-9x^3+20x^2$

$\int x\left(7+x^5\right)dx$

$25t^2-104t+116$

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

$\frac{1}{x^3+5x}$

$108c^{\left(7\right)}-300c^{\left(6\right)}+404c^{\left(5\right)}-334c^{\left(4\right)}+156c^{\left(3\right)}-48c^{\left(2\right)}$

$\left(10x-1y\right)^2$