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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 function arctan(x^4). To evaluate it as an infinite series, recall the Taylor series expansion for arctan(x), which is given by: arctan(x) = sum_{n=0}^{infty} (-1)^n * x^(2n+1) / (2n+1).
Step 2: Substitute x^4 into the Taylor series expansion for arctan(x). This means replacing x with x^4 in the series, resulting in: arctan(x^4) = sum_{n=0}^{infty} (-1)^n * (x^4)^(2n+1) / (2n+1).
Step 3: Simplify the expression (x^4)^(2n+1). Using the property of exponents, (x^4)^(2n+1) = x^(4*(2n+1)) = x^(8n+4). Thus, the series becomes: arctan(x^4) = sum_{n=0}^{infty} (-1)^n * x^(8n+4) / (2n+1).
Step 4: To find the indefinite integral of arctan(x^4), integrate term by term. The integral of each term in the series is: integral((-1)^n * x^(8n+4) / (2n+1) dx) = (-1)^n / (2n+1) * x^(8n+5) / (8n+5).
Step 5: Combine the results to express the indefinite integral as an infinite series. The final series is: sum_{n=0}^{infty} (-1)^n / (2n+1) * x^(8n+5) / (8n+5) + C, where C is the constant of integration.