Use the total differential to approximate the change in 
as (x, y) varies from 
to 
.
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A health insurance policy purchased by an employer or organization that covers the eligible individuals within that group, often at a reduced cost.
Subscriber
The person who has been insured; an insurance policyholder.
Insurance Policyholder
An individual or entity who owns an insurance policy and is entitled to coverage and benefits as specified in the policy agreement.
CHAMPVA
A health care benefits program managed by the Department of Veterans Affairs for the dependents of veterans who are permanently and totally disabled due to service-related conditions.
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