$\:x-2y+3x-11x-13x+8x$
$\int\left(7x^3e^{-2x}\right)dx$
$\frac{-5m^2n}{mn^2}$
$30-\left(12-7+4\right)$
$1.32^x=0$
$cos\left(75\right)cos\left(15\right)-sin\left(75\right)sin\left(15\right)$
$2x^2+8x^2+8x+32$
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