$m^2n^2-m^2n-2m^3n^4$
$x+3=343$
$\int\frac{8x+3}{\left(4x^2+3x\right)^3}dx$
$2x\sin x^2$
$7+6-3\cdot9$
$\left(1+\frac{4i}{n}\right)$
$12c^3b^3+18cb^2$
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