$\lim_{x\to0}\left(\frac{e^x}{2^x}\right)$
$22xy-13xy+3xy$
$\sin2c\cdot\sin c=\cos c$
$4x^2+12x+3$
$u^2-14u+49$
$\frac{2y^3}{3y}$
$x\:dy+y\:dx=xy^2dy$
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