$x^2-4x+3\le0$
$\frac{2y}{y+2}-\frac{y}{y+3}=\frac{3}{y^2+5y+6}$
$g=m\cdot y+\frac{a\cdot f^2}{2}$
$\int-5sec^4\left(\frac{x}{2}\right)dx$
$a^3\left(a+2\right)+3a\left(a+2\right)$
$c2+c$
$9x^2+2\:para\:x\:=5$
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