$\int\frac{\left(7x^3-3x^2+5\right)}{x^2-x}dx$

$\frac{\left(a+b\right)^3-\left(a-b\right)^3}{3ab^2+b^2}$

$\lim_{x\to3}\left(x^2-8x+15\right)ln\left|x-3\right|$

$f\left(x\right)=\left(3x^2+5x\right)^3$

$\lim_{x\to\frac{\pi}{6}}\left(\frac{6}{\sin\left(3x\right)}\right)$

$1-20$