$u^{-2}\cdot u^7$
$\frac{dy}{dx}=6.25$
$3000-375$
$\frac{cot\left(x-1\right)}{1-tan\left(x\right)}$
$\left(3x+5a\right)\left(3x-5a\right)$
$cos2x\:cos5x$
$7-\left(32-45\right)-6+\left(12-45\right)$
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