$\left(\frac{2}{x}-\frac{x}{4}\right)^2$

$x^8-y^{16}$

$\lim\:_{x\to\:+\infty\:}\left(-3x^3-25x^2-12x-17\right)$

$\left(3z^3-y^2\right)^2$

$- ( 7 n - 24 ) ^ { 2 }$

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

$y=\ln\left(\sqrt{\frac{1+\sin\left(5x\right)}{1-\sin\left(5x\right)}}\right)$