Please note the two parts in this question are not related. {a} Find an equation of the tangent plane to the surface of z = 333:2 2elzy+2323 at {12,6}. {bl Given that the function T=f{x,y,z] is a differentiable function with f(2,2,3) = 3, fI(2, 2,3) = 5, fyf2,2,3) = 4, fz(2,2,3) = 2, find the linear approximation and the differential of the function at {22.3}. Use the differential to estimate the total change .&T when x is increased by 0.1, y is decreased by 0.04. and z is decreased by 0.06. Enter your answer in the blank below. Round your answer to two decimal places