$3x<9x+4$
$\frac{\left(x^2+2y\right)^2-\left(x^2-2y\right)^2}{4}$
$\frac{d}{dx}ax^2+2hxy+by^2=1$
$x^2+8x+7=0$
$\frac{dy}{dx}\left(\frac{e^x}{sinx}\right)^3$
$-25\::\:-8$
$\frac{1}{cotx\left(1-cos2x\right)}=\csc\left(2x\right)$
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