$2x^2+3y-4z^2+3x-5y+z^2$
$\left(2x-3\right)\left(2x+3\right)-\left(2x+1\right)=-4x-10$
$722+135+102$
$\int x\cdot\cos\cdot\:\cos\left(2x\right)dx$
$\left(4x-3\right)\left(2x^2+5\right)$
$2\int\frac{1}{\left(x^2+2\right)^2}dx$
$\:\:\:\:\:\:12\:-\:\left(-5\right)\:+\:2x\:-\:2x\:+\:3\:-\:\left(-3x\right)$
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