$4a^2-18a+81$
$\left(pq\:+\:4\right)\:\left(pq\:-\:6\right)$
$4\sin^2\left(x\right)+2\sin\left(x\right)=4$
$\frac{dy}{dx}=\frac{y+3x}{x+3y}$
$\left(0.25\right)^3$
$10-\left|-2+\left(-3-4-1\right)+1-\left(-4-2+3-1\right)-4\right|$
$4\left(4y-3x\right)$
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