$\cot^2\left(b\right)=\csc^2\left(b\right)-1$
$\frac{-2xy^2}{2x^2y}$
$m^2+3m-28$
$12b-15>21$
$x=3,\:y=2,z=4$
$\frac{5}{8}x\frac{3}{4}$
$\frac{d}{dx}\left(e^xlny=x\right)$
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