$\"\"$

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The function is $\"\"$ .

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Find the first partial derivative $\"\"$ .

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$\"\"$ .Differentiate partially with respect to $\"\"$ treating $\"\"$ and $\"\"$ as constant.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find the first partial derivative $\"\"$ .

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$\"\"$ .

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Differentiate partially with respect to $\"\"$ treating $\"\"$ and $\"\"$ as constant.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find the first partial derivative $\"\"$ .

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$\"\"$ .

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Differentiate partially with respect to $\"\"$ treating $\"\"$ and $\"\"$ as constant.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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First partial derivatives are $\"\"$ , $\"\"$ and $\"\"$ .