Directional Derivative & Triple integral problems
Hi to all again =) I have 2 questions about directioanl derivate & Triple integral things.
1) The temparature in a rectangular box is approximated by
If a mosquito is located at , in which direction should it fly to cool off as rapidly as possible?
2 A wedge is cut from a right circular cylinder of radius R by a plane perpendicular to the x-axis of the cylinder and a second plane that meets the first on the axis at an angle of degrees. Set up an evaluate a triple integral for the volume of the wedge.
These two are questions and i don't know where to begin so i couldn't make any progress.
Gonna be very appriciated for any help.