$\left(x^2-1\right)+\left(1-14x+49x^2\right)$

$\frac{2x-3}{x^2-2x-8}$

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

$216-\frac{120}{-6}$

$\int\frac{\left(x+\left(x^2+1\right)^{\frac{1}{2}}\right)}{\left(x^2+1\right)^{\frac{3}{2}}}dx$

$16y^2-24y$

$-4x^3+x^2+16x-4$