$x^{-5}x^3$

$\int\frac{d\theta}{\sen^{2}4\theta}$

$\log\left(\frac{x^5\cdot y}{\sqrt[4]{y\cdot z}}\right)$

$4\left(x+17\right)\left(x+25\right)$

$\frac{dx}{dy}=y\csc\left(x\right)$

$\lim_{x\to0}\left(\frac{5\sin\left(x\right)^2}{1+\cos\left(x\right)}\right)$

$x\left(x-2\right)+3x\left(x-3\right)$