$-0,23+1$
$\lim_{x\to2}\left(3+2x+x^2\right)$
$\cos\left(x\right)^2+2\cos\left(x\right)=3$
$\ln\left(x^6\right)$
$4m^2+n-m^2$
$\frac{3x+1}{4x-2}$
$\left(2x+1\right)\left(3x-7\right)$
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