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

$\frac{1}{5}\left(15+10y\right)$

$\int\left(x^2\left(x^3-11\right)^9\right)dx$

$d^2-5d+4d^2$

$-3\left(\frac{1}{2}x^3y^2\right)$

$\frac{2\left(r+2s\right)}{8r+2s}\cdot\frac{3r-s}{r+2s}$

$\log_a\left(x^2+4\right)-2\log_a\left(x+6\right)$