Use the chain rule to find and, where First the pieces: дz ?х ?х дя ду Əs = дz Ət || = And putting it all together: дz дя მs - дz ду ?х Ət ду Ət = II Е - 1 z = = x² + xy +y²,x = 9s + 5t, y = 5s + 5t -

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A: Note : As per our Guidelines , we can solve first three subparts . Please repost remaining parts.

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