$\lim_{x\to\infty}\left(\:\frac{\left(\sqrt[2]{\left(1+x\right)}-1\right)}{x^2}\right)$
$1+7+19+13$
$\lim_{x\to+\infty}\left(\sqrt{4x^2+x}-2x\right)$
$2\sec^2x-\sec^4x$
$\int3x\left(x+4\right)^6dx$
$4\cdot18^2$
$14x^2-35$
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