$\int\frac{2x^2-5x-18}{x^3+x^2+6x}dx$

$\frac{\left(2a^2b^{-1}\right)^3}{12a^{-5}}$

$\lim_{x\to\infty}\left(\frac{7x^4-12x^3}{3x^3-15}\right)$

$\lim_{x\to\frac{1}{2}}\left(\frac{x^2+5x}{4x-6}\right)$

$\int_0^23x^3\left(4x+1\right)^{-\frac{1}{2}}dx$

$-170+\left(-80\right)+97$

$2\cdot\left(2\right)+2\cdot\left(-1\right)$