$400y^{10}+40y^5+1$

$\int\frac{9-x}{\left(x-1\right)\left(x+3\right)}dx$

$\frac{55x^2y^3}{5yx}$

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

$\left(senx+cosx\right)^2\left(senx-cosx\right)^2$

$\left(y^4-1\right)\left(y+1\right)$

$\left(0.1g+2.5f\right)\left(0.1g-2.5f\right)$