$r^2cos^4+r^2sen^4$

$\left(x^{16}\right)^6$

$\frac{d^5}{dx^5}\left(sec\left(x\right)\right)$

$\left(\frac{e^3}{y^4}\right)^5$

$\left(5x-2\right)\cdot\left(2x^2-3x\right)+\left(x^2+2\right)\cdot\left(4-2x\right)$

$\lim_{x\to0}\left(\frac{x-\sin\left(x\right)}{\log\left(xy\right)^2}\right)$

$\frac{\left(-2x^3y^3\right)}{-3yx^4}^4$