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Multiple Choice
Evaluate the indefinite integral as an infinite series: .
A
+ C
B
+ C
C
+ C
D
+ C
Verified step by step guidance
1
Step 1: Recognize that the integral involves the term (cos(x) - 1)/x, which suggests using the Taylor series expansion for cos(x). Recall that cos(x) can be expressed as a power series: cos(x) = ∑_{n=0}^{∞} (-1)^n x^{2n} / (2n)!.
Step 2: Subtract 1 from the Taylor series expansion of cos(x). This modifies the series to exclude the constant term (n=0), leaving: cos(x) - 1 = ∑_{n=1}^{∞} (-1)^n x^{2n} / (2n)!.
Step 3: Divide the resulting series (cos(x) - 1) by x. This adjusts the powers of x in the series, resulting in: (cos(x) - 1)/x = ∑_{n=1}^{∞} (-1)^n x^{2n-1} / (2n)!.
Step 4: Integrate term-by-term. The integral of each term in the series ∫ x^{2n-1} dx is x^{2n}/(2n), and the factorial term (2n)! remains unchanged. This gives: ∫ (cos(x) - 1)/x dx = ∑_{n=1}^{∞} (-1)^n x^{2n} / [2n (2n)!] + C.
Step 5: Verify the series representation and compare it to the given answer choices. Ensure that the derived series matches one of the provided options, and note that the constant of integration (C) is added to account for the indefinite integral.