$140\:+\:210+890+145\:$
$90.12-50.4$
$25m^4n^6-49m^6n^{10}$
$\frac{1+csc^2\left(x\right)}{csc^2\left(x\right)}=1$
$\frac{d}{dx}2\sec\left(x\right)^2$
$\frac{7}{2a^2}+\frac{9}{3a^3}$
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