a) Use the total differential dz to approximate Az. Use f(2,1) and f(2.12, 1.09) where f(x,y) = x cos y b) Find az/ax and az/ay for x² + 2yz + z² = 1. Use implicit differe tiation.

Q: WOW THANKS! Can you help with question 18 too? I realized I already answered 20 after i sent it

A: Here is the solution:

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