$\"\"$

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The point on the polar coordinates is $\"\"$ .

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Rectangular coordinates : $\"\"$ and $\"\"$ .

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Consider $\"\"$ .

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Substitute $\"\"$ .

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$\"\"$

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Consider $\"\"$ .

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Substitute $\"\"$ .

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$\"\"$

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Therefore, the rectangular coordinate is $\"\"$ .

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$\"\"$

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Rectangular coordinate is $\"\"$ .