$\"\"$

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The rectangular equation is $\"\"$ .

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$\"\"$ (Substitute : $\"\"$ )

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$\"\"$ (Substitute : $\"\"$ ) $\"\"$

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$\"\"$ (Add $\"\"$ to each side)

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$\"\"$

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$\"\"$ (Divide each side by r)

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$\"\"$ (Simplify)

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The polar form is $\"\"$ . $\"\"$

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The polar form is $\"\"$ .