$\left(18\right)\left(4\right)+\left(18\right)\left(-2\right)\left(11\right)$
$4x-8=-16$
$\frac{d^2}{dx^2}\left(ln\left(x-1\right)\right)$
$2x<-4$
$\int81dx$
$75y+64-9$
$\:\frac{cos\left(t\right)-sin\left(t\right)}{1-tan\left(t\right)}$
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