Use the formula for geometric series to expand the function 
in a power series with center 
. Determine the values of 
for which it is valid.
Definitions:
Simplify
The act of making an expression as simple as possible.
Expression
A combination of symbols that jointly express a quantity or number, which can include variables, constants, and operating symbols.
Simplify
The process of making a mathematical expression as simple as possible by performing all operations and reducing to the fewest terms.
Expression
A mathematical phrase that can contain numbers, variables, and operation symbols but doesn't have an equal sign.
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