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Write a polar equation of an ellipse with eccentricity and directrix .
High-value Users
Individuals or entities that contribute significantly to a company's revenue, often through consistent purchases or use of high-tier services.
Metering Strategy
Approaches used by companies to measure and charge for services based on usage or consumption.
Doll Accessories
Items designed to complement or enhance the play value or display of dolls, such as clothing, furniture, or vehicles.
Tie-in Sale
A sales technique where one product or service can only be purchased if another product or service is bought simultaneously.
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