$m^3n+m^3n-x^2y+x^2y$
$135+22$
$\frac{cos3x+cos5x}{2\cos\left(x\right)}=cos\left(x\right)$
$15x^4+22x^3$
$\left(m-9\right)\left(m+7\right)$
$\ln\left(x\right)\left(x-1\right)^2$
$\left(2xy\right)\left(2x^2y\right)$
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