If x^2 + y^2 + z^2 = 9, (dx/dy) = 3, and (dy/dt)= 9, find

Last updated: 8/11/2022

If x^2 + y^2 + z^2 = 9, (dx/dy) = 3, and (dy/dt)= 9, find (dt/dz) when (x, y, z) = (2, 2, 1). dz/dt =