$e^tsec\pi-t$
$\sqrt{2+1}.\:\sqrt{3}$
$-0.116\cdot12^3+1.84\cdot12^2-20.71\cdot12+40$
$\left(m^2n+n^3\right)^2$
$3x^2+6xy+9xy^2$
$csc\:x-\frac{1}{3}csc^3\:x$
$2x+1\le3x+2$
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