$-189\:_{\:-21}$
$2x^2+\left(4x-6x^2\right)+9-\left(6x+3x\right)$
$25z^2-30z+9$
$\left(3x+2\right)\left(2x-8\right)$
$\int x\left(3x+1\right)^{-\frac{1}{2}}dx$
$\frac{x}{\sqrt{1-x^2}}-arcsenx$
$\cos\left(x+1\right)-\cos\left(x-1\right)$
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