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Functions expressed as power series
What You'll Learn
Convert functions into power series using the geometric series formula
Identify the common ratio r by algebraically manipulating functions
Apply the formula 1/(1-r) = Σ r^n to express functions as infinite series
Determine intervals of convergence from the absolute value of r
Differentiate and integrate power series term by term
Express derivatives and antiderivatives of functions as power series
What You'll Practice
1
Converting rational functions like 1/(1-x²) into geometric series
2
Factoring and manipulating denominators to match the 1/(1-r) form
3
Finding intervals of convergence by solving |r| < 1 inequalities
4
Integrating power series to express logarithmic functions
5
Differentiating power series and adjusting series indices
Why This Matters
Power series representations are essential for calculus and higher mathematics. They allow you to approximate complex functions, solve differential equations, and analyze functions that can't be expressed in simple closed forms. This skill is foundational for Taylor and Maclaurin series in advanced calculus.