$\lim_{x\to\pi}\left(\frac{7\cos\left(x+7\right)}{\left(x+\pi\right)^2}\right)$
$5^3x\:5^4$
$\frac{x^2-2x-3}{x^2-4x+3}$
$\lim_{x\to8}\sqrt[3]{x}-\sqrt{x+1}$
$\frac{d}{dx}x\:arc\:cos\:4x^2$
$\lim_{x\to\infty}\left(\frac{\left(7sinx-7x\right)}{x^3}\right)$
$2x+5y=-1$
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