$x^2+18x+85$

$22+53x+x=-20+60x$

$64r^2-196$

$\int\left(\frac{\left(t-2\right)\left(t-1\right)}{\sqrt{t}}-\frac{2}{\sqrt{t}}\right)dt$

$\int\frac{-9x^3}{\sqrt{x^2+9}}dx$

$cot^4\left(x\right)+cot^2\left(x\right)=csc^4\left(x\right)+csc^2\left(x\right)$

$\left(\:x+2y\right)\:\left(2y-x\right)$