$x+\frac{5}{2}x$

$\lim_{x\to1}\left(\frac{1-\cos\left(2x-1\right)}{x-1}\right)$

$\lim_{x\to0}\left(\frac{\sqrt{2+x^2}-\sqrt{2-x^2}}{x^2}\right)$

$\frac{d^2}{d^2x}\left(3x^3+2y^3=5\right)$

$81w^2-18w+1$

$1a^2+1b^2-2b^2-3a^2-1a^2+1b^2$

$\:\left(2xy\right)^{-2}\left(xy^2\right)^3$