$\lim_{x,y\to0,0}\left(\left(\frac{tan\left(x^2y\right)}{x^2+y^2}\right)\right)$
$196a^{12}-16$
$4x-4x^2$
$\lim_{x\to0}\left(\frac{sinx}{xcosx}\right)$
$\left(x^2-49x\right)\:\left(x+7\right)$
$3x=-9$
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