$\lim_{x\to1}\left(\frac{xsin\left(x-1\right)}{x^3-x^2-x+1}\right)$

$\left(2x-5\right)\left(3x^{2}-2x+6\right)$

$x^{-1}$

$x ^ { 2 } + 2 y ^ { 2 } = 6 x$

$5\:log\:m$

$\frac{4\tan\left(x\right)^2}{\left(16+4\tan\left(x\right)^2\right)^{\frac{3}{2}}}$

$\frac{d}{dx}\frac{tan^2x}{2}$