$\frac{dy}{du}=\frac{u-1}{yu}$

$-7x^3+3x^2-5x$

$\left(2n-\frac{1}{5}\right)^3$

$\ln\left(\sqrt{6x^5y^3}\right)$

$\lim_{x\to\pi}\left(\frac{sin^2x}{cos3x+1}\right)$

$\frac{d}{dx}\left(\frac{x^8\left(x-3\right)^4}{\left(x^2+8\right)^8}\right)$

$2\sin4\left(x\right)-\sqrt{2}=0$