$3\cdot5-2\cdot\left(3+2\right)$
$u^4\cdot u\cdot u^4\cdot u^2$
$4-2t>0$
$3xy^3\left(2-3nx+4nx^2-n^2x^3\right)$
$7cos2x-\:sen2=1\:$
$4d^2-20d+25$
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