əz Ət = əz əx əx ət + əz Əy ду дt Let function g (x,y) = 3x + y ln y sin (1 − x) Assume z as function differentiable at x and y defined implicitly by Z E : zy + y = g(x,y) - 2 If additionally, x and y are said to be functions of r and t represented by-rte = x and e = y, use chain rule (multivariate) to r + 2t дz evaluate when r = -1 and t =1. at

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