$\lim_{x\to0}\left(\frac{\sin\left(2x\right)}{x^2+x}\right)$
$2x^4+x^2$
$xdy-5secydx=0$
$-5\left(x-12\right)-15$
$4\left(5d+4\right)$
$\frac{355}{5}+42$
$\lim_{x\to\infty}\left(\frac{x+5}{x+3}\right)^{x+3}$
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