$\left(3xy-5a\right)x\left(3xy+2\right)$
$\frac{a}{x}=p$
$\sqrt{2}+4\sqrt{2}$
$2\cos\left(a\right)-2\cos^2\left(a\right)=\sin\left(a\right)\sin2\left(a\right)$
$\int\:z^3e^2dz$
$2x\:-\:7y\:+\:3x\:-\:18z\:+\:3y\:+\:2z$
$\int\frac{\sqrt{x}^2-9}{x}dx$
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