$\lim\:_{x\to\:o}\left(\frac{xcosx-senx}{x^3}\right)$
$\left(8e+56ef\right)^2$
$\left(12xy\:-\:\frac{4y^2}{3}\right)^2$
$4y\sin\left(2x\right)dx=dy$
$121x^4-144x^8$
$7=-2\left(1-x\right)+x$
$\sqrt[3]{x^7}$
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