Let z= 28x + 32xy - 8y , where x(t,s) = cosh (4t) cos (5s) and y(t,s) = sinh (4t) sin (5s). ze at (t,s) = at In (2), (i)Use the chain rule to compute 1 In 8 (ii) Use the Chain rule to compute at (t,s) = as a z (i) at 器-口 %3D (ii) as R L5

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