$\int\cot^4\left(\frac{1}{2}x\right)dx$
$r^2-16r+63$
$\left(3d-t\right)^3$
$\frac{1}{y-1}dy=\frac{e^x}{2\left(e^x+4\right)}dx$
$-y^2-y^2$
$121a^2-44ab+4b^2$
$6a-4\left(a+5\right)$
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