$\frac{x^3-1}{x^2+1}$
$8cos\left(\theta\right)=2$
$\sin\left(x\right)=-\frac{21}{29}$
$e^{2x}\cdot2e^{2x}$
$\left(3x^2\right)\left(2x^2+7\right)$
$\frac{4x^2+9x-4}{x+3}$
$2,50+2,50$
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