$2.52\cdot3$
$25a^2-144b^2$
$\frac{d}{dx}\:\:5\:x^2+y^3=25xy+1$
$48,5+0,433$
$\left(6x+2y\right)^2-\left(6x-2y\right)^2$
$\left(y^2+ty^2\right)\cdot\:\frac{dy}{dt}+t^2-yt^2=0$
$4x^2\:+\:20x\:+\:25\:=\:1$
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