$x^5\left(8-x\right)$

$20xy^2-5xy+10x^2y-5x^2y^2$

$b^4+625b^2+168^2$

$\frac{9.41}{113}$

$\lim_{x\to0}\left(\frac{7x^4+x^3+4x-2}{x+1}\right)$

$5+15+20y$

$\frac{1+\cot\left(x\right)}{\csc\left(x\right)\cot\left(x\right)}+\frac{\cot\left(x\right)-1}{\csc\left(x\right)}$