$\frac{\left(\frac{1}{x}-x\right)}{1-\frac{1}{x}}$

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

$\left(l+x\right)\left(l-x\right)$

$\frac{dy}{dx}=2y\left(1-y\right)-\frac{3}{8}$

$-x^a+1+x^a+1$

$2a+3b-7=15$

$\left(q\left(q\left(q\left(q\left(q\left(2\right)\right)\right)\right)\right)\right)$