$13-5\cdot9+8$
$\left(9m^9n^5w^6\right)\:\left(10m^4\:n\:z^4\right)\:$
$xy^3dx+e^{x^2}dy=0$
$\int_{-\pi}^0\sin\left(18x\right)\cos\left(15x\right)dx$
$x^2-9>0$
$3xy^2+4x^2y+3xy^2$
$15x^2+7x=2$
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