\"\"

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The rectangular equation is x = 4a.

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Apply formula: \"\"

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\"\"                                (Substitute : x = 4a)

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

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\"\" \ \

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\"\"\"\"

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\"\"                    (Take out common factor)

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\"\"                         (Pythagorean identity: \"\")

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\"\"                                  (Simplify)

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\"\"

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\"\"                                    (Reciprocal identity: \"\")

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

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The polar form is \"\".