$7-5-\left(-1\right)+5$
$\lim_{x\to2}\left(\frac{x^3-4x^2+4x}{x^2-4x+4}\right)$
$\frac{dy}{dx}=\frac{y^2}{x};\:y\left(1\right)=1$
$5x\:\left(x-7\right)$
$\frac{3^2-9^2}{2\cdot7-5}$
$\lim_{x\to0}\left(\frac{x-1}{x^n-1}\right)$
$r^2-1$
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