$\frac{x^4+3x^3-2x^2+1}{x+5}$

$4xdx-y^2dy=0$

$\tan\left(a\right)=\cot\left(a\right)-2\cot\left(2a\right)$

$x^2-\frac{2}{5}+\frac{1}{25}$

$\lim_{x\to-5}\left(\frac{x^2+3x-10}{3x^2+15x+25}\right)$

$8m^3+16m^2n$

$\int\frac{\cos\left(x\right)}{16-\sin\left(x\right)^2}dx$