$x^2-x-4xy^2$
$\lim_{x\to1}\frac{\ln\left(x\right)}{\sin\left(\pi x\right)}$
$7x^2+21x+7$
$x^2+14x+23$
$\lim_{x\to\infty}\left(\frac{2^x-5^x}{5^x}\right)$
$\lim_{x\to\infty}\left(\frac{\cos\left(ax\right)-cos\left(bx\right)}{x^2}\right)$
$\left(2-3x\right)^4$
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