$\left(y+xy\right)+\left(x-xy\right)\frac{dy}{dx}$
$\left(6x^2-7\right)+\left(2x+3\right)$
$\int\:\left(t^2-4t-1\right)e^{4t}\:dt$
$\left(\sec^2\left(a\right)-1\right)\cdot\cot\left(a\right)$
$\int6\cot^4\left(4x\right)dx$
$81.4-72.1+51.2-82.3$
$5x-2+5x-2+3x-0.5+3x-0.5$
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