$-1\left(-4\right)\left(-5\right)$
$\frac{d}{dx}7\sqrt{8x^2}$
$x^4-4x^3+8x^2-16x+16$
$\lim_{x\to0}\left(\frac{e^x-1}{\cos x}\right)$
$\left(x^2-1\right)\:x\:$
$4x^2-\:20x\:+\:25$
$\lim_{x\to\infty}\left(\sqrt{2x^2+3}\right)\:-\left(\sqrt{2x^2-5}\right)$
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