$4y-6y-4y$
$9b+9b$
$\cot\infty+\frac{1}{\cot\infty}$
$\int\frac{1-cos\left(2x\right)}{2}dx$
$\frac{178.2}{6}$
$x=4s+2t$
$\int\left(4\left(t^2+3t\right)\right)dt$
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