$2x-9\le x+4$
$-a-b-b-a$
$cos\:\left(2\theta\:\:-\:10^\circ\:\right)\:=\:-0.6$
$3x^2-7x-9$
$\int\frac{-1400}{\sqrt{25-x^2}}dx$
$x^2-8x+1$
$\left(6x^2-7x\right)^2\left(4x-2\right)^3$
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