Find dydx\displaystyle \frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{x}\right.}}} for y=cos(3x)8x5\displaystyle {y}=\frac{{{\cos{{\left({3}{x}\right)}}}}}{{\sqrt{{{8}-{x}^{{{5}}}}}}}.

dydx\displaystyle \frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{x}\right.}}} =