$\frac{cos\left(x-y\right)+cos\left(x+y\right)}{-sinxcosy}$
$\frac{dy}{dx}=18\sqrt{y}$
$16+24p$
$\left(\frac{6x^{-2}y^3}{\left(18x^7y^{-4}y\right)^{-2}}\right)^{-1}$
$9b-7c-9d+2d$
$22x^3-22x^2-11x$
$\left(x^2+3x+2\right)\frac{dy}{dx}+xy=x\left(x+1\right)$
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