$\lim_{x\to\infty}\frac{1}{\sqrt{x+1}-\sqrt{x-1}}$
$4\:cos\:2\theta\:+\:3$
$\frac{12x^3+5x^3+13x+14}{3x+2}$
$-4xdx+\left(yx^2-3y\right)dy=0$
$25a^4-9c^2$
$3y^2-x^2=9$
$16x^2+26x+9$
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