$\sec^2\left(x\right)dy-\csc\left(y\right)dx=0$
$\frac{dx}{df}=f^2+f^2x$
$9\left(2x+8x\right)$
$\frac{dy}{dx}\left(x^2-1\right)+x\left(y-9\right)$
$\lim_{x\to0}\left(\frac{\left(1-2cosx+\cos\left(x\right)^2\right)}{x}\right)$
$\frac{9}{2}+\frac{1}{2}$
$\left(2+7x\right)\left(2+6x\right)$
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