$\"\"$

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The polar equation is $\"\"$ .

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The maximum value of $\"\"$ for a polar equation $\"\"$ is $\"\"$ , when $\"\"$ .

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The maximum value of $\"\"$ for a polar equation $\"\"$ is $\"\"$ ,

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when $\"\"$ .

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The zeros of $\"\"$ for a polar equation $\"\"$ is $\"\"$ , when $\"\"$ .

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The zeros of $\"\"$ for a polar equation $\"\"$ is $\"\"$ , when $\"\"$ .

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$\"\"$

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The maximum value of $\"\"$ is $\"\"$ ,when $\"\"$ .

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The zeros of $\"\"$ is $\"\"$ when $\"\"$ .