$40x-6x^2$
$\int x\ln\sin\left(x\right)dx$
$\frac{x-3}{2x+5}\ge1$
$36-12n^2+n^4$
$4t^2-3t+9=0$
$1+tan2\:a=\sec\left(x\right)$
$\left(2x^2-4xy+3y^2-2x\right)-\left(5x^2+2xy+8y^2+4x+3y\right)$
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