$9xy-3z-6xy+4z+2xy$
$m^4+m^3+m^2=0$
$y^2=576$
$\left(-3x+1\right)\left(x-9\right)$
$\int e^{\frac{2x}{5}}dx$
$61+-300$
$\frac{\cot\left(x\right)}{sen\left(x\right)}=\frac{1}{\sin\left(x\right)}$
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