$\frac{\sec-1}{\tan^2}$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\sec^2\left(x\right)}{\sec^2\left(3x\right)}\right)$

$3n^2\cdot\frac{\left(xy\right)^0}{2m^3}$

$\left(4u-5v\right)\left(16u^2-20uv+25v^2\right)$

$\frac{\left(4a^3b^{-5}\right)^3}{10a^{-2}}$

$x^2+14x+33$

$\frac{\tan\left(x\right)}{\sec x-1}$