$pr-rs$
$\:\frac{1}{7}ab+\frac{1}{14}ab+\frac{1}{28}ab+ab$
$y^2-ay$
$\frac{2\cdot5}{2}+\frac{0}{-3}$
$\frac{dy}{dt}-2y=1$
$cosec2x=-4$
$\int\left(xsqrt\left(y\right)\right)dx$
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