$\left(x+1\right)\left(x-1\right)\left(x^2+1\right)\left(x^4+1\right)+1=x^8$

$4x-y+5-6x+2y$

$\int_1^2\left(x-9\right)e^{3x}dx$

$\lim_{x\to-5}\left(\frac{x^2+12x+35}{-63-2x+x^2}\right)$

$\left(20^2+20x-120\right)$

$\left(\frac{x^2}{2}-\frac{3}{4}\right)^3$

$xy^2+3y^2-x^2y'=0$