$4x^2-2y^2dx=2xydy$
$4z^2-36z+81$
$lim\:x,y->0\:of\:3x+\sqrt{5y}$
$\left(2x^2\right)\left(2x^2+5x-7\right)$
$x2\:-\:7x\:-\:12\:<\:0$
$8b+27=2y-3$
$-3+2-5+4\cdot3$
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