$6x^2+3x+20x+10$
$3+\left(a+5\right)$
$\left(a^2x+by\right)^2$
$cos\:x\:=\:0.3$
$2x^2-8x+16$
$\frac{33}{x^2\:+3x\:-28}$
$-17+7\left[-28-13\right]$
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