$9xy^2+3xy-6x^2y$
$\lim_{x\to3}\left(\frac{x^3+27}{x}\right)$
$a^6+2a^3b^3+b^6$
$x^3\frac{dy}{dx}+x^2y=3$
$-5-12-1-18$
$tan^2\:xcos^2\:x=sin^2\:x$
$7x\:+\:4xy\:-12x+\:6xy$
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