$\left(x-3\right)^2=-4$
$x^2dx=-y\left(x-1\right)dy$
$25x^2+9y^2-18y-216=0$
$2^3\cdot3$
$x^2-21x+104$
$\int\frac{65}{\left(x+9\right)\left(x-3\right)}dx$
$\lim_{x\to\infty}\left(\frac{2x\cot\left(\frac{2}{x}\right)-3\cot\left(\frac{2}{x}\right)}{5x^2-2x}\right)$
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