$\frac{x^3-3x+9}{3}$
$\sqrt{25}-\:x^2$
$4x^2+1xy^2+625$
$\csc\:x=\sqrt{cot^2a+1}$
$\left(2a+7y\right)\left(2a-7y\right)$
$-1+2-2+1-3$
$\:3x\left(\:4x\:+\:2\:\right)\:-\:12x\:+\:4$
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