$\lim_{x\to\infty}\left(\frac{x-e^x+1}{x\left(e^x-1\right)}\right)$
$\cos^2x-\sec^2x$
$\frac{x^2+5x+3}{x+6}$
$dy-cy-kdx$
$\left(-5\right)\left(4\right)\left(2\right)\left(-3\right)$
$\left(-9\right)\left(5\right)\left(4\right)$
$\sen^{2}x+7\sin x=0$
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