$18\:-\:\left(-6\right)\:$
$2\left(-2\right)^3-4\left(-2\right)^2+8$
$3x^2-4x+2^2$
$\sin^2=\cos^2\tan^2$
$8,4a^2-23234,71a-3093560=0$
$36x^2-12x+1$
$\left\{63-\left(52+19\right)\right\}-\:\left(14-\left(13\right)\right)$
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