$\frac{d}{dx}x^2+y^2+2xy+y=45$
$\frac{1}{9}a^3-\frac{18}{9}a^2$
$x^2=x^8$
$\lim_{x\to0}\frac{\cot\left(3x\right)}{\cot\left(6x\right)}$
$5x^2-50x+30=0$
$7x+2+3-7x$
$\frac{d}{dx}\frac{1}{2}\left(\csc\left(x^2\right)\right)$
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