$2a+\left(3a-4\right)$
$2 ( 3 ( 3 ) ) ^ { 2 }$
$\int_0^{\infty}\left(\frac{x}{2+x^2}\right)dx$
$4x^{-2}\cdot2x^3$
$-5x^3+4x^2+5x\left(-4\right)$
$z=16-x^2-y^2$
$1-64x^{3}$
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