Find a polar equation for the curve represented by the given Cartesian equation. 
Definitions:
Life Expectancy
The average period that an individual is expected to live, based on demographic factors such as current age and health conditions.
Roth Retirement Plan
A type of retirement account that allows qualified withdrawals on a tax-free basis, provided certain conditions are met.
Withdrawals
The act of taking money out of an account.
Tax Free
Refers to financial income or accounts that are not subject to taxation by the government, often used to encourage specific investments or savings.
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