$\left|-3-\left(1-6\right)+5\right|-8-\left(9-2\right)$
$20y^2-y-12$
$\:\:\:x^2\:+\:3y^3\:+\:2+\:2x^2+\:y^3\:+\:7\:$
$\left(1+x\right)^{\frac{1}{2}}\frac{dy}{dx}=xy^3$
$\cot\left(3\right)\cdot\cot\left(3\right)$
$a^2+10a+16$
$\left(-2-2^2\right)$
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