$x+1,\:9-x^2$
$\left(-50\right)\cdot\left(-7\right)$
$cos\:5x\:cos\:4x$
$xy=100$
$\:\left(a+b\right)^2-\left(b-a\right)^2$
$\left(b-6\right)^3$
$2.7-4.2$
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