$a^2b^2\infty14ab+49$

$\lim_{x\to2}\left(2-\frac{x^2-4}{2x-x^2}\right)$

$x^2\frac{dy}{dx}-3xy+2x^2=0\:with\:y\left(1\right)=3$

$\left(x^4-11x^2-2x^3+28x-12\right)$

$\frac{1+bx^2}{x-x^2}$

$\csc\left(x\right)\cdot\sec\left(x\right)=\sec\left(x\right)$

$-3-2x^{-1}\ge0$