Let x2+3y2+z2=14x^2 + 3y^2 + z^2 = 14x2+3y2+z2=14. Find ∂z∂x\frac{\partial z}{\partial x}∂x∂z at the point (1,1,2)(1, 1, 2)(1,1,2).
−12-\frac{1}{2}−21
−14-\frac{1}{4}−41
−13-\frac{1}{3}−31
−23-\frac{2}{3}−32