$\frac{-7}{10y^2}-\frac{5}{6y^3}$
$xy+5f=18$
$a^2-2a-48$
$\frac{d}{dx}y=6u^3\:u=7x-4$
$14x^44$
$\lim_{x\to0}\left(\frac{1-cosx\:cos3x}{1-cosx}\right)$
$3ax^2-6ax+3a$
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