$\left(-5\right)\:-\:\left(-85\right)\:$
$4a+5\left(8+2a\right)$
$\sin\left(-t\right)\cdot\tan\left(t+\pi\right)-\cos\left(-t\right)$
$x^{21}\left(-1+\frac{1}{x^{19}}\right)+4$
$\left(6x^2y\right)\left(12xy^2\right)$
$cos\left(-0.1\right)$
$x+3<-2$
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