$\left(15-b\right)^2$
$x^2+48x+9$
$e^x\frac{dy}{dx}+5e^xy=4$
$6\cdot3+6\cdot2$
$3xy^2-18x^2y+9x^2y^2$
$-3\:.\:10\:+\:11\:-\:4\:$
$\lim_{x\to2}\left(\frac{x+\sqrt{x+2}}{\sqrt{4x+1}-3}\right)$
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