$\lim_{x\to\infty}\left(\frac{x+4}{\sqrt{2x^3-5x}}\right)$
$\frac{1}{4}\int\sqrt{x^2-4}dx$
$-5x^4+3x^2$
$2\cdot\:\:cosx+secx-sen^2x\cdot\:\:secx=1$
$\int\frac{4}{x^3\left(x^2+1\right)}dx$
$.7108+.27688$
$-2\sin\left(x\right)x\cos\left(x\right)$
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