$\lim_{x\to\infty}\left(\frac{2x^2-2x-3}{x^3+2x^2-x+1}\right)$

$( \hat { a } )$

$16-\left|10+\left(-8\right)\right|-\left(-12\right)+4$

$f\left(f\right)=5\sqrt{\left(x^3+1\right)}^3$

$\left|-\left(-6\right)-\left(-2\right)\right|$

$-28x^2+13x+1$