$\frac{1}{-2\left(\infty\right)^2}$

$\csc\left(x^3\right)\frac{dy}{dx}=6x^2cos^2y$

$\lim_{x\to\infty}\left(\frac{sin\left(\sqrt{x}-3\right)}{x-9}\right)$

$7\cdot11\cdot a\cdot a\cdot a\cdot b\cdot b$

$1-18h-81h^2$

$\frac{dy}{dx}+y\cos\left(x\right)=6\cos\left(x\right)$