$3\cdot13$
$\int\:\:cos\left(7\theta\:+3\right)d\theta\:$
$\frac{x^3+2x^2+3x+2}{x-1}$
$y'=\frac{3x}{2y}$
$\frac{15xy}{5}$
$m\left(n+1\right)-5\left(n+1\right)$
$\frac{2x^2+19x+36}{x+7}$
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