Note :

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Parametric differentiation :

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If $\"\"$ then,

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$\"\"$ , and

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$\"\"$ , provided $\"\"$ .

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The parametric equation is $\"\"$ .

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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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$\"\"$

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$\"\"$

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$\"\"$ .

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Therefore, $\"\"$ .

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