Let z = f(x,y)³ = g(t), and y = h(t) be differentiable functions. If fₓ(1,1)=2; fᵧ (1, 1) = 2 ;f(1,1)=2; g(3)=1 ;h(3)=1 ;g'(3)-3; h'(3)=4
find the value of dz/dt at t = 3.