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

$\int5x^4\left(x^5+4\right)^3dx$

$\int\frac{\cos^2\left(x\right)}{1+\sin\left(x\right)}dx$

$\frac{8}{2}ab+\frac{6}{4}abc+\frac{7}{3}ab-\frac{1}{2}ab+\frac{2}{4}a^2b+\frac{1}{2}ab$

$\left(x^2y^3+6\right)\left(x^2y^3-8\right)$

$\left(x+3y-4z\right)\left(x+2y+z\right)$

$\frac{4x}{x-2}-\frac{6}{x-3}=4$