85. z = Cos xy -y² cos xy -y sin xy, Əx %3D %3D = -yx cos xy sin xy - дудх 22- = - SII ty, x-cos xy = -xy cos xy sin xy dxdy What did theyuse to get this answer ? As in did that you 7delta x or y PREV 75 85 87 89 91

Q: i need answer of part D only please give typed answer

A: Q

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Q: Hi can u help with question E please?

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A: As per our guidelines, we are supposed to answer only 1 question. Kindly repost the other question…

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A: Data1087106195610871067103214321058

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