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

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

$\int\frac{2t^3-t^2+3t-1}{t^4+3t^2+2}dt$

$22+1+7$

$\lim_{x\to3}\left(x^3-5x^2-4x+9\right)$

$16x^2y^8-25$

$\left(2y^3\cdot3y\right)^3$