$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cot x}{\cos x}\right)$
$\frac{81x^3y^5}{9xy^6}$
$\frac{dy}{dx}=\frac{2-e^x}{3+2y}$
$\left(x=12\right)\left(x+3\right)$
$\int\left(1+y^3\right)^2dx$
$\:78d+23d-32d+12f+5f+21d$
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