$\"\"$

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Find $\"\"$ .

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The parametric equations are $\"\"$ and $\"\"$ .

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The function is $\"\"$ .

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Apply partial derivative on each side with respect to $\"\"$ .

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The chain rule of derivatives : $\"\"$ .

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in above equation.

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find $\"\"$ .

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The function is $\"\"$ .

\

Apply partial derivative on each side with respect to $\"\"$ .

\

The chain rule of derivatives : $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ and $\"\"$ in above equation.

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$ .