$4x^2+8x-120$
$\int-9x\cdot\sin\left(10x\right)$
$\frac{tan2a}{tan2a}$
$\left(2x^2-3x-2\right)+2\left(x-3\right)$
$z-z$
$\int_{20}^{\infty}\left(9\cos\left(x\right)\right)dx$
$\int_0^2\left(30+4t\right)e^{-.1t}dt$
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