$\left(ye^x-2x\right)dx+e^xdy=0$
$x^2-3x-550=0$
$-4x^{-1}$
$\frac{3x^2-x-2}{x+4}$
$f\left(x\right)=\frac{1}{\cos\left(x\right)}$
$2a^2+9a\:-5$
$\left(-3\right)\cdot\left(-2\right)\cdot\left(-10\right)\cdot4$
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