$t\frac{dx}{dt}=x-1$
$\lim_{x\to4}\left(\frac{xln\left(4x\right)}{2}\:-\:\frac{x^2}{4}\right)$
$2x^4y-x^2y+x=2$
$\frac{1-sec}{tan}-\frac{tan}{1-sec}=2cot\:\theta$
$\frac{1}{x+2}+\frac{1}{x+2}$
$\frac{dy}{dx}x+xy=0$
$x ^ { 2 } + 6 x y + 9 y ^ { 2 }$
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