$xdy-4ydx=0$
$-16-\left(-6\right)-\left(5\right)$
$4pq-7pq$
$mn\:+\:1\:+\:2amn\:+\:2a$
$\frac{sec^2a}{1+cot^2}$
$27xy-72x$
$\frac{d}{dx}\sqrt{\frac{1}{x+1}}$
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