$\left(x^3-1\right)\cdot\left(x+1\right)$

$\frac{3x^6+x^4-x^2-3}{x+1}$

$\left(tanx-8sinxsiny\right)dx+\left(8cosxcosy\right)dy=0$

$\int\sin\left(8x\right)\sin\left(5x\right)dx$

$\lim_{x\to1}\left(\frac{\ln\left(x\right)^3}{x^2-1}\right)$

$2x^2+5x+20=0$

$\int_0^x\left(\frac{1}{8-2x}\right)dx$