$\frac{2a^5b^9}{8a^5b}$
$-t^{-2}\left(-t^{-2}\right)$
$a^3-5a^2-4a$
$\left(1-\sin^2a\right)\left(1+\cot^2a\right)=1$
$9\left(x-y\right)^2-25x^2$
$-4.3\cdot0.02$
$3x-3<-8$
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