$m^3-3m^2n+2mn^2\cdot m^2-2mn-8n^2$
$\int te^{2t+1}dx$
$-12.3-\:5,7$
$\frac{\left(1+sin\left(x\right)\right)\left(1-sin\left(x\right)\right)}{cos\left(x\right)}=cos\left(x\right)$
$6xy+8xy-4xy-2xy$
$7ab-7bc$
$3d^{-4}\left(4d^4\right)$
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