$\left(4\right)^2-4\left(-8\right)\left(6\right)$
$\int\frac{2}{3+\sqrt{x-2}}dx$
$3c^2-4c-4=0$
$5x\:-\:9\:en\:x\:=-2$
$\left(x+y-1\right)\left(x-y-1\right)$
$x^2+2xy+y^2;\:x=2;\:y=3$
$3x^2-12x+4$
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