$\"\"$

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The polar equation is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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Squaring on eachside.

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$\"\"$

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The equation rectangular coordinates $\"\"$ .

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$\"\"$

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The equation in rectangular coordinates is $\"\"$ .