Let z(x, y) = = xy where x = r cos(70) & y r cos (70) & y = r sin(-90). მ მ- მე მყო მყ მთ მყ Calculate & by first finding & , მ მძ მუ’მ’მ0 , 0 and using the chain rule. Note: To produce the ) symbol, type the word "theta". მ = მო მz ᎧᎾ =

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