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Multiple Choice
Which of the following is a power series representation for the function centered at ?
A
B
C
D
Verified step by step guidance
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Step 1: Recall the Taylor series expansion for arctan(x), which is given by: arctan(x) = sum_{n=0}^{∞} (-1)^n x^(2n+1) / (2n+1). This series is centered at x = 0 and converges for |x| ≤ 1.
Step 2: Substitute x^3 into the arctan(x) series to find the series representation for arctan(x^3). Replace x with x^3 in the formula: arctan(x^3) = sum_{n=0}^{∞} (-1)^n (x^3)^(2n+1) / (2n+1).
Step 3: Simplify the powers of x in the series. Since (x^3)^(2n+1) = x^(3(2n+1)), the series becomes: arctan(x^3) = sum_{n=0}^{∞} (-1)^n x^(6n+3) / (2n+1).
Step 4: Multiply the function f(x) = x^2 by the series representation of arctan(x^3). This means multiplying x^2 by each term in the series: f(x) = x^2 * sum_{n=0}^{∞} (-1)^n x^(6n+3) / (2n+1).
Step 5: Combine the powers of x. Since x^2 * x^(6n+3) = x^(6n+2), the final series representation for f(x) = x^2 arctan(x^3) is: sum_{n=0}^{∞} (-1)^n x^(6n+2) / (2n+1).