$\left(2x\:-\:3xy\right)\:\left(2x\:+\:3xy\right)$
$16y^2-40y+16y^2$
$0,345-0,6+2,0$
$6x-25-12+5x$
$-125+-78+-79+-180+-56$
$\left(e^y-1\right)y'=2+cosx$
$\left(ab\right)^2-\left(bc\right)^2$
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