$m^2-n^2-m-n$
$9^9\cdot6^5\cdot2^8$
$-7x^2y^2-7x^3y^2-5+4x^2yz^4+10$
$\left(2x^2+y^3\right).\left(2x^2+y^3\right)$
$xy'-2y=x^3e^x$
$3 x ^ { 5 } - 2 x ^ { 2 } + 9 x ^ { 4 } - 5 x + 3$
$\left(\frac{x^{-8}}{y^{11}}\right)^{-2}$
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