$\"\"$

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The parametric curve is $\"\"$ , $\"\"$ .

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Show that the curvature of the plane is $\"\"$ .

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The 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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the curvature of the curve is $\"\"$ .

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Substitute the corresponding values.

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$\"\"$

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$\"\"$

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Therefore, the curvature of the curve is $\"\"$ .

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$\"\"$

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The curvature of the curve is $\"\"$ .