Suppose: w = f (s,t) s = s (x, y) and s(1, 10) = –6 t =t(x, z) and t(1, –9) = 3 Ultimately, after substituting in the lower variables, w (x, y, z) will be a function of x, y, and z. Write down the Multivariable Chain Rule (assume everything is differentiable) formula for: Wz (1, 10, –9) = fs (???, ???)* s? (???, ???)+more terms! [Use Lagrange notation (the subscripts)!] Hint: Where do we evaluate each partial derivative?

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