$\csc\left(3+x\right)\cot\left(3+x\right)$
$\frac{dy}{dx}+3x^2y=9x^2,y\left(0\right)=1$
$5x^3-x$
$\frac{1}{9}^{-1}\cdot\frac{4}{5}^{-1}$
$4+20m+25m^2$
$5x-7<=16x+1$
$2x^2-x-15=0$
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