Question Number 126442 by BHOOPENDRA last updated on 20/Dec/20
$${maximum}\:{value}\:{of}\:{direction}\:{derivative}\:{of}\:\Phi:{e}^{\mathrm{3}{x}} {sin}\left({yz}^{\mathrm{4}} \right){at}\left(\mathrm{0}\:\:,\pi/\mathrm{4},\:\:\mathrm{1}\right)\:{is}? \\ $$