$\lim_{x,y\to0,0}\left(\frac{\left(e^{2y}-1\right)}{xy}\right)$
$9xyz=9\cdot x\cdot y\cdot z$
$1029-65+12-28$
$8cot^2x+12cot\:x-8$
$y'=e^{4x}-5senx\:$
$x^3y^5+2x^4y$
$2\:x^2\:-7x\:+5=0$
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