$x^2-20x+25$
$-67-\left(-41\right)$
$2x^2-2x-7$
$\lim_{x\to\infty}\left(\frac{8x^3+3x^2-5x}{2x^2-6x+1}\right)$
$\left(\frac{\left(1+4x^2\right)}{l^2}\right)^{-\left(\frac{1}{2}\right)}$
$\frac{d}{dx}\frac{2x^2-8}{x}$
$f\left(x\right)=\sec\left(2x-x^3\right)$
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