$\frac{d^3}{dx^3}\left(4x^4-3x^3+2x^2-x-1\right)$
$2contx\:-\:\sqrt{2}=0$
$\frac{4}{x+2}\le-2$
$9-\left[\left(-5\right)\right]-\left(mas\:7\right)$
$\frac{1-\cos\left(40\right)}{\sin\left(40\right)}$
$\log\left(x\right)+\log\left(x+3\right)=4$
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