$3x^2+6y+12xy$
$3y-y+8y$
$\lim_{x\to0}\left(\frac{\sqrt{x+3}-3}{x}\right)$
$\left(6\:y^2\:+\:9\:x^2\right)\:dy\:+\:\left(18\:x\:y\:+\:6\:x^2\right)\:dx\:=\:0$
$1+-3+-3+-7$
$cos2x=-0.913545457$
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