$\"\"$

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The polar coordinates is $\"\"$ .

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Polar-to-Rectangular coordinates : $\"\"$

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$\"\"$ (Substitute : r = 1 and $\"\"$ ) $\"\"$

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$\"\"$ ( $\"\"$ )

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$\"\"$

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

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The rectangular coordinates is $\"\"$ .